Database Users

Kernels on Froyo

So I get terrible battery life with .33.4 kernels (925 or 800) but got phenomenal battery on Ravens 800mv from 5/03. Are there any .33.3 kernels that will have the right drivers? How hard would it be to mod?
Thanks

Have you considered just sticking with the stock kernel? I'm getting phenomenal battery life with the stock Froyo kernel. Last I checked, i was at 46% after 28 hours unplugged (pretty heavy usage too - streaming music over 3G, several phone calls, tons of texting, youtube, web browsing)

r34p3rex said:
Have you considered just sticking with the stock kernel? I'm getting phenomenal battery life with the stock Froyo kernel. Last I checked, i was at 46% after 28 hours unplugged (pretty heavy usage too - streaming music over 3G, several phone calls, tons of texting, youtube, web browsing)
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My battery is getting raped on froyo almost to the point that I want to roll back to enoms 2.1

r34p3rex said:
Have you considered just sticking with the stock kernel? I'm getting phenomenal battery life with the stock Froyo kernel. Last I checked, i was at 46% after 28 hours unplugged (pretty heavy usage too - streaming music over 3G, several phone calls, tons of texting, youtube, web browsing)
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what do you do to get that much battery? my battery life isnt so good on froyo

I tried stock. Wasn't great but was better than avs.
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Sent via the XDA Tapatalk App

all kernels are going to depend on how much you play with it, and what you have running. if you don't have a load of widgets, background data, bluetooth, etc running, you should get decent battery life.
the more crap you run, the more energy it takes. common sense.

timothydonohue said:
all kernels are going to depend on how much you play with it, and what you have running. if you don't have a load of widgets, background data, bluetooth, etc running, you should get decent battery life.
the more crap you run, the more energy it takes. common sense.
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This!
And I am getting pretty good battery life off the stock Froyo kernel. Actually, I am only draining at 2.2% an hour, and have had my screen on for 1hr 57 minutes, and the device off the charger for 14 hours. I have also made about 45 minutes of phone calls, and let it download with the screen off a bit.

Personally I have similar battery life to what I was getting on cm with uv/oc kernal. It does appear like it might be a little worse but I need time to be sure. Regardless I have gained small but real improvements with battery life on both cm and enom using the custom kernals and I have no reason to expect another result with froyo. Since battery life isnt exactly something I would describe as gratuitous on the N1 I will be kernaling up as soon as one looks like it actually works without issues. Right now thats not exactly the situation as I read down in development. There are a few usb mounting issues going one way and no cam going the other. Hopefully there will be a more hashed out kernal soon as the guys get more time to play with it. So getting back to the begining you ought to have something to work with shortly.

So no one will ever get the old kernels working with Froyo, huh?

If only I could find one that worked well without the USB dismount issue or the wifi issue, everything I've tried has failed. IMO 2.6.34 so far has worked best for me but has the dismount issue. I've tried four so far and none of them work well. I did get pretty proficient at moving zip files from dropbox to the sd card though.

Battery life seems to be so across the board dependent on so many variables that it sometimes seems like it's not even worth trying to gauge other people's experiences. I've tried numerous ROM/Kernal/Usage/Setting combinations and have never gotten what I'd consider to be 'good' battery life. 2.2's no exception.
I just ended up buying this 2 battery and external charger pack off of eBay for 20 bucks and admitting defeat. Our superphones are luck of the draw it seems when it comes to battery life. I'd follow someone's set up to the letter and get nowhere near the battery life they claim to get. I can turn off syncing, keep the screen dim, run a kernel that's supposed to get great battery life, and still get around 3%-5% drain per hour on standby.
My morning routine has me use bluetooth stereo headphones for about 25 minutes on the metro while I look at a couple of webpages. From out the door fully charged I'll be down to around 82% when I get into the office. To me, that's laughably terrible, but it's the only life I've ever known with my Nexus One.

halorin said:
Battery life seems to be so across the board dependent on so many variables that it sometimes seems like it's not even worth trying to gauge other people's experiences. I've tried numerous ROM/Kernal/Usage/Setting combinations and have never gotten what I'd consider to be 'good' battery life. 2.2's no exception.
I just ended up buying this 2 battery and external charger pack off of eBay for 20 bucks and admitting defeat. Our superphones are luck of the draw it seems when it comes to battery life. I'd follow someone's set up to the letter and get nowhere near the battery life they claim to get. I can turn off syncing, keep the screen dim, run a kernel that's supposed to get great battery life, and still get around 3%-5% drain per hour on standby.
My morning routine has me use bluetooth stereo headphones for about 25 minutes on the metro while I look at a couple of webpages. From out the door fully charged I'll be down to around 82% when I get into the office. To me, that's laughably terrible, but it's the only life I've ever known with my Nexus One.
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It is terrible and I was in the same boat as you. I found the kernel from 4/29 800mv and 5/03 800mv to be the big winners for me. Any other kernels and my battery drops like dead weight.

hah2110 said:
It is terrible and I was in the same boat as you. I found the kernel from 4/29 800mv and 5/03 800mv to be the big winners for me. Any other kernels and my battery drops like dead weight.
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Hm.. You're talking about Intersect's I'm assuming? How do they fair with Froyo? I'll have to try to track those down.

halorin said:
Hm.. You're talking about Intersect's I'm assuming? How do they fair with Froyo? I'll have to try to track those down.
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Ya. The two kernels I mentioned are the ones that had me going 1.5-3 days depending on usage.

In right there with you guys. I unplugged at 8am and now its 10am and I'm at 78% this is how its always been.

I downloaded the 5/03 one and I'm trying that one out now, thanks. Maybe we'll see some improvement. It sucks to lose the ability to record video for a chance at battery life on par with what I'd get on a RAZR, but that's the world we live in.

halorin said:
I downloaded the 5/03 one and I'm trying that one out now, thanks. Maybe we'll see some improvement. It sucks to lose the ability to record video for a chance at battery life on par with what I'd get on a RAZR, but that's the world we live in.
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Your RAZR doesn't have a 1ghz processor and a 3+" screen either... I'm not happy either but I'm just sayin'...

THATTON said:
Your RAZR doesn't have a 1ghz processor and a 3+" screen either... I'm not happy either but I'm just sayin'...
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True enough, but phones in the same category perform much better than ours in terms of battery life, and they never made the claim to be 'superphones'. And AMOLEDs are designed to not use a lot of juice, but HTC somehow botched that idea, from my research.

halorin said:
True enough, but phones in the same category perform much better than ours in terms of battery life, and they never made the claim to be 'superphones'. And AMOLEDs are designed to not use a lot of juice, but HTC somehow botched that idea, from my research.
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I agree... Hopefully the "final" release of Froyo will have an updated kernel addressing the battery life. To be, it's not a big deal because I am always near a charger but it would be nice to be able to get through an ENTIRE day of heavy usage without worrying about the battery dying.

I havent had a smartphone recently that could didn't need to be charged every night. I would love better battery life as I jmake it through weaker usage days at about 40% moderate usage at about 25% and with heavy use I have to find a way to get plugged in to get through. Still, reading how other similar phones (large screen 1 ghz etc) are doing leads me to believe that the N1 is roughly comparable. I'm not sure how you can compare a modern smartphone to a far less power hungry (and capable) feature phone that a person almost certainly did less with over the course of a day?

Better Battery Than They Say

Ok so I read a post that said drain your battery completely for better performance so i did.Got low bat warning and played Avatar to kill it quick.Only it didnt die fast,seemed like forever for this damn thing to really die!!!Maybe I just imagined it so I tried it again.Got low bat warning and watched a 25 min youtube vid followed by a 16 min youtube vid and several rap videos before it cut off.Try it and see how long it takes to really run out of juice and I think youll be surprised

I remembered with my G1, that once i got the low battery warning, I was always able to milk every ounce of power from that battery.

after picking up my vibrant yesterday, i charged to a full 100% with the phone turned off
i've been on it all day long, installing apps and restarting quite frequently, and i just got my first battery warning (21%)
will probably run it into the ground after work for another full cycle charge then just charge whenever it needs it. seems to have more than enough to make through a full day, and i'm only saying this because i haven't been able to put it down since this morning and it's still ticking
edit: and this is all done indoors with fluctuating 3g/2g coverage (home and work)

I have twice run my battery into the ground and charged to 100% with the phone off. Now I am getting a little over 25 hours on a single charge. this battery is indeed better than they said it was.

ardchoille said:
I have twice run my battery into the ground and charged to 100% with the phone off. Now I am getting a little over 25 hours on a single charge. this battery is indeed better than they said it was.
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Better than what?
If coming from an old WM, sure, it's better.
But coming from an iPhone, which lasted for 2 days with real use, the battery of the Vibrant sucks.
With moderate use, I can's get through a full day (14-16 hours). It's the one real problem I have with this otherwise great phone.

MacGuy2006 said:
But coming from an iPhone, which lasted for 2 days with real use, the battery of the Vibrant sucks.
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3GS or 4? cause the battery on anything before that was abysmal.

lolcopter said:
3GS or 4? cause the battery on anything before that was abysmal.
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I had two 3Gs (now have a Galaxy S and a Vibrant). It lasted almost double what the Vibrant does, with similar use.
Love the screen of the Samsung, but the battery is making me a little depressed. I am hoping that Froyo will improve it a bit.

MacGuy2006 said:
I had two 3Gs (now have a Galaxy S and a Vibrant). It lasted almost double what the Vibrant does, with similar use.
Love the screen of the Samsung, but the battery is making me a little depressed. I am hoping that Froyo will improve it a bit.
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yeah, hopefully drops sometime soon.
it seems battery life is either really good or really poor, not a lot of middle ground. of course, this could mostly be because of different peoples' opinions. but i'm coming from a dumbphone i only had to charge once a week, and so far i'm pretty impressed. like i mentioned earlier, i've been on this thing non-stop since this morning, and it's just now flashing the battery symbol at me. i imagine once i go through a couple of full cycles, and the new toy factor wears off, it will be a non-issue (for me)
what is your real world usage like?

MacGuy2006 said:
I had two 3Gs (now have a Galaxy S and a Vibrant). It lasted almost double what the Vibrant does, with similar use.
Love the screen of the Samsung, but the battery is making me a little depressed. I am hoping that Froyo will improve it a bit.
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Why not just buy some extra batteries? I picked up 3 extra batteries for when I fly so I can watch movies with no worries...
I get great battery life on my Vibrant. Make sure you turn off everything that you don't need....wifi, gps, keep screen brightness low and not on 100% at all times etc...obvious stuff....

lolcopter said:
what is your real world usage like?
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Just checking email and talking for maybe 30-60 minutes, plus a few texts.
iunlock said:
Why not just buy some extra batteries? I picked up 3 extra batteries for when I fly so I can watch movies with no worries...
I get great battery life on my Vibrant. Make sure you turn off everything that you don't need....wifi, gps, keep screen brightness low and not on 100% at all times etc...obvious stuff....
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Man, I have turned the brightness down to below stock, and I do have two extra batteries. But that's kind of like going back to my WM days.
After the getting spoiled on the iPhone, which would last for almost two full days with everything running, and with similar use, I really hate having to constantly think about the battery, and worry that it's going to die on me.
True story:
Someone hit my car a few days ago and I tried to take a pic with my Vibrant. It was in late afternoon, so the battery was at 15% I guess -- so the phone effectively told me to "F*** Off." Or at least that's how I took it No pic, of course.

MacGuy2006 said:
Just checking email and talking for maybe 30-60 minutes, plus a few texts.
Man, I have turned the brightness down to below stock, and I do have two extra batteries. But that's kind of like going back to my WM days.
After the getting spoiled on the iPhone, which would last for almost two full days with everything running, and with similar use, I really hate having to constantly think about the battery, and worry that it's going to die on me.
True story:
Someone hit my car a few days ago and I tried to take a pic with my Vibrant. It was in late afternoon, so the battery was at 15% I guess -- so the phone effectively told me to "F*** Off." Or at least that's how I took it No pic, of course.
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I hear where you're coming from...have you tried switching out the battery to a different one? I know that some of the batteries were faulty and gave people horrible battery life.
The iPhone also ran at a much slower clock speed and it was equipped with a pretty good battery. There's no denying the awesomeness of the iPhone battery...I'm just thinking that you may have a bad battery. Try changing it out.
There's also a 2800mAh battery pack coming out very soon....it may suit your wants and needs...

The iPhone also lacks widgets and multitasking - and the screen is not as bright so those all help in maintaining battery life.
If you crippled your android in the same way - you could get 2 days pretty easily as well.

dseo80 said:
The iPhone also lacks widgets and multitasking - and the screen is not as bright so those all help in maintaining battery life.
If you crippled your android in the same way - you could get 2 days pretty easily as well.
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Very true...
It's like a Geo Metro vs. Ferrari ...hypothetically, if they had the same size gas tank which one would consume more gas and run out faster? It's obvious...

iunlock said:
Very true...
It's like a Geo Metro vs. Ferrari ...hypothetically, if they had the same size gas tank which one would consume more gas and run out faster? It's obvious...
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Come on now....
I have both, and they both have their good points and bad points.
The battery is a bad point for the Vibrant.
The screen is the best point (it's actually not "brighter", but has much better contrast than a backlit LCD). I keep the Vibrant's screen at it's lowest brightness, anyway.
But in terms of speed, there is really not much difference in daily use - if anything, the iPhone 3Gs feels a little smoother much of the time. Again something Froyo might improve.
My well conditioned battery is at 5%, after 16hrs 54 min., with very light non-call use today (calls are at 49 min. 26 sec.).
My point is, that I have to expect more after using the iPhone, while some here are obviously happy with it. But it ain't great.

MacGuy2006 said:
Come on now....
I have both, and they both have their good points and bad points.
The battery is a bad point for the Vibrant.
The screen is the best point (it's actually not "brighter", but has much better contrast than a backlit LCD). I keep the Vibrant's screen at it's lowest brightness, anyway.
But in terms of speed, there is really not much difference in daily use - if anything, the iPhone 3Gs feels a little smoother much of the time. Again something Froyo might improve.
My well conditioned battery is at 5%, after 16hrs 54 min., with very light non-call use today (calls are at 49 min. 26 sec.).
My point is, that I have to expect more after using the iPhone, while some here are obviously happy with it. But it ain't great.
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Something is wrong with your battery if that's all you're getting.

vapotrini said:
Something is wrong with your battery if that's all you're getting.
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We get five to six hours of display on with this phone. That number is perfect if the phone was on 35% precent or more of those 16 hours.
Sent from my SGH-T959 using XDA App

It's ALL about the apps you use.
My battery life is pretty good, I can go two days with moderate phone use and my normal heavy-e-mail and occasional messaging usage. I don't do much web browsing with it, but I fiddle with it constantly throughout the day.
My friend couldn't get through one day on his, so I encouraged him to play around with some of the apps he had that I didn't, and now he can get well into day two before it gets low enough he wants to recharge.
My wife complained about her battery life, and I realized she was pinging four e-mail accounts once per minute. Just cutting that back to a five minute interval made a huge difference.
Even so, I've ordered spare batteries and a charger since I travel often and a missed call could cost me a lot of money, and they're too cheap to not keep a few around. (In one of those other threads somebody linked to an ebay deal with two batteries and a charger for 8 bucks.)

vapotrini said:
Something is wrong with your battery if that's all you're getting.
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or he's got a bunch of widgets.
That's almost universally a theme when people complain about Android battery usage.

Got my replacement Vibrant yesterday afternoon, charged it full while turned off and took it out at around 9pm. Worked on it a little last night and today installing apps browsing and about 60 min talk time so far.... 3PM and still got 30% left.
Definitely much better battery life than the one I had on first phone. I did get a replacement battery as well, but haven't tested that one yet. This one so far is working as expected.
I haven't rooted yet so I am not sure if that and lag fix has any affect on the battery.
Also ATK is not installed yet, and i hear it has adverse affect on battery. Is that true?

what do you guys see on the battery code?
G7, G8 or G9?

The Epic 4g's Battery Life is Really bad...

These numbers dont look encouraging at all. Hopefully this 3g power drain isnt all hardware and can be fixed up in software...
http://www.anandtech.com/show/3891/samsung-epic-4g-review-the-fastest-android-phone/8

icantdrawanime said:
These numbers dont look encouraging at all. Hopefully this 3g power drain isnt all hardware and can be fixed up in software...
http://www.anandtech.com/show/3891/samsung-epic-4g-review-the-fastest-android-phone/8
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Mine is just fine. gets me through a full 8 hour work day and then some. Its right there with the evo and other android devices. Want better battery life?, unferclock it like iphone 4.
Sent from my SPH-D700 using XDA App

rufflez2010 said:
Mine is just fine. gets me through a full 8 hour work day and then some. Quit trolling.
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Well mine just sucks as does the gps. My wife and kid was lost yesterday and the nav/gps would not work. Screw this piece of chit.
Sent from my SPH-D700 using XDA App

Battery life does suck. Can't do anything on the phone for fear of the battery crapping out.

Expectations
Not sure what you are expecting as far as battery life but I have spent hours doing everything from GPS to downloading apps from wi fi and I get about a good 7 - 8 hours. No problems here.

Battery life threads bother me.
You ask your phone to do everything but wipe your rear end. It does more than Apple ever thought about, and we demand even more as customers. Faster Data, faster processors, more ram. Guys I hate to break it to you - but you want battery life go get a feature phone or blackberry. Otherwise, quit complaining about all the stuff you ask your device to do on such a small amount of energy. If we would quit caring so much about design and weight, phone companies could pack a car battery into it for you - look at Sedio... completely ruins the aesthetics of the phone, but you get longer battery life!
<conclusion>
Shut up or give up, battery technology just ain't there yet - and probably will never be able to match our demands until we have little nukes in our pockets.
</conclusion>

My EVO was pulling roughly 15-20 hours of battery life out of a full charge.
Thus far, I haven't been able to break 12 hours with the Epic, doing the same thing and with roughly the same usage. It's more than enough for a day, and I'm almost never near a charger (office, car, home, etc) but it'd be nice to have an extra boost. Bought those 2 for 10 Chinese batteries as a just in case.

At work right now and while streaming dubstep.fm and chatting on aim, my Epic is discharging while it's plugged into the charger.

You people that come into ever battery thread telling everyone to quit complaining and lauding the 8 hours of battery life you phone gets are not only completely missing the point, you're also contributing nothing to the discussion and perpetuating this conception that a third of a day is more than good enough for a phone's battery life. I mean, ****, my laptops get 8 hours of battery life.
The issue here is that we can clearly see that an android phone can get as much as 4 hours of 3g browsing time and 8 hours of wifi browsing time. The fact that this phone fails to come even close to that amount is alarming. A 25% reduction 3g browsing time and a whopping 38% reduction in wifi browsing time should make you question what is going on in this phone. Especially since the manufacturing process that produced this SOC is supposed to be much more power efficient than the one that produced the HTC evo.
I for one am really hoping samsung is aware of this issue and that battery life can be improved via some software tweaks. I owned the HTC evo. I was able to easily get 20 hours of battery life out of that phone doing the exact same things I do now. I was hoping to be able to match that with this phone. But right now, there is definitely an issue. Any of you people that deny it are seriously deluding yourselves.

I too have been frustrated by the surprisingly poor battery life. I've been holding back on believing it is a real problem because the first few days I had my Evo, it too had terrible battery life. However, with the Evo, after some battery conditioning, a hard reset and configuring the phone for what I wanted it to do vs what it came configured to do (Ex: I do not need push email, google voice or 4G running all the time and 25% screen brightness with a widget to switch it to 100% when needed) the Evo stepped up to the plate and settled into a cadence of giving me over 24 hours of use on a single charge.
I've had an Epic for over a week now. I've used it exactly as I do my Evo. I configured it the same as the Evo and in some cases with more extreme battery preserving (Ex: set the screen brightness to zero and only sync email every two hours (rather than the Evo's every hour)) and I can barely make it 14 hours, and that is a 14 hour DEAD stop.
Two other issues that are driving me crazy are the GPS and 3G performance.
It seems that when I'm sitting at home, the GPS will lock in about 10 seconds, but if I'm on the road in a random place (when I need the GPS the MOST) it will simply not lock if I'm driving and if I stop, it will eventually (maybe 5 minutes) lock.
3G performance has been absolutely horrible. I put the Epic right next to an Evo and TP2 and the Epic will get between 1/4th to 1/8th the throughput of the others. If I switch to Wifi, all is well and 4G is comparable (although not as reliable) to the Evo.
I am a keyboard person, the only thing wrong with the Evo was it did not have a keyboard. The Epic is exactly what I want, but these three strikes are making it tough to love. The 3G problem should be easy to fix with an update, as for the GPS and battery I don't know. I'm anxiously watching Sprint / Samsung to see if they will produce an update (see if they stand behind this product.)
BTW, at the end of a day, the number 1 battery culprit (according to the battery settings) is the display. With approx 1 to 1.5 hours of use at 0% brightness with an all black background, it still takes 50% to 65% of the battery (people posting that Super AMOLED saves battery over LCD are simply wrong.) The next offenders are Cell standby and phone idle. I was experiencing the 50% no signal problem, the workaround to cycle airplane mode helped that. But it does bring up another issue, although I have not had any call drops, the signal strength is consistently two bars (out of 6) lower than my Evo and TP2 (sitting right next to each other. At my home and in my office, my Evo and TP2 get 5 to 6 bars (full signal) but the Epic is 3 bars. I know the bars shown are not a good indicator and I don't have any dropped calls, but I wonder if this is not causing battery drain. This also makes me concerned that the main problem with this phone may not be solvable with software, it may be poor antenna design / implementation.

Wow, if more people actually realized that the SAMOLED screen uses MORE battery when displaying white pixels, we'd see less threads like this and less articles like the one posted.
On SAMOLED screens, each pixel is individually lit. White requires the most light. Constant web browsing will kill your battery FASTER than anything else because white is the color of choice when it comes to mobile web pages.
With that being said, OTHER THAN WEB BROWSING the battery on the Epic is much better than the EVO.

hmm i made a thread on 3g battery drain just the other day glad to see some actual evidence to back it up.

hydralisk said:
Wow, if more people actually realized that the SAMOLED screen uses MORE battery when displaying white pixels, we'd see less threads like this and less articles like the one posted.
On SAMOLED screens, each pixel is individually lit. White requires the most light. Constant web browsing will kill your battery FASTER than anything else because white is the color of choice when it comes to mobile web pages.
With that being said, OTHER THAN WEB BROWSING the battery on the Epic is much better than the EVO.
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Wonder if we could hack together a browser mod to invert colors?

Kcarpenter said:
Wonder if we could hack together a browser mod to invert colors?
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Heh. That would be nice. In the meantime, I use a darker wallpaper. When using the kindle app, I use white text on a black background. I keep my brightness at 0% (surprisingly still pretty bright) unless I go outside.

My battery if fine too. Turn off wat u don't need and you'll be fine. Mine lasts 8 or 9 hours. U can't expect to use this beast at full power doing everyting all the time and expect this 1500 battery t be magically long lasting. Same prob with evo. Tame the beast
Sent from my SPH-D700 using XDA App

A-effing-men man. The more features the phone has (or that you use), of course the more battery its going to drain. I came from the 9630 blackberry and i had about 6-10% battery drain per hour so this Epic isnt too bad of a switch for me since i am a heavy user.
Kcarpenter said:
Battery life threads bother me.
You ask your phone to do everything but wipe your rear end. It does more than Apple ever thought about, and we demand even more as customers. Faster Data, faster processors, more ram. Guys I hate to break it to you - but you want battery life go get a feature phone or blackberry. Otherwise, quit complaining about all the stuff you ask your device to do on such a small amount of energy. If we would quit caring so much about design and weight, phone companies could pack a car battery into it for you - look at Sedio... completely ruins the aesthetics of the phone, but you get longer battery life!
<conclusion>
Shut up or give up, battery technology just ain't there yet - and probably will never be able to match our demands until we have little nukes in our pockets.
</conclusion>
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Anyone know of any extended batteries for it? I was quite happy with my G1's thickness, so adding a few mm on here should be fine.
(Also, screw form over function - last thing I want is a pretty, comfortable brick.)

Lol I had the same issue, so im taking it back and sticking with my evo and its badass extended battery
Sent from my PC36100 using Tapatalk

DJPUSA said:
Not sure what you are expecting as far as battery life but I have spent hours doing everything from GPS to downloading apps from wi fi and I get about a good 7 - 8 hours. No problems here.
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Really sad when "a good 7 - 8 hours. No problems here" is now the yard stick battery life we expect from smartphones. Nothing smart there really.

TheMostToys said:
I too have been frustrated by the surprisingly poor battery life. I've been holding back on believing it is a real problem because the first few days I had my Evo, it too had terrible battery life. However, with the Evo, after some battery conditioning, a hard reset and configuring the phone for what I wanted it to do vs what it came configured to do (Ex: I do not need push email, google voice or 4G running all the time and 25% screen brightness with a widget to switch it to 100% when needed) the Evo stepped up to the plate and settled into a cadence of giving me over 24 hours of use on a single charge.
I've had an Epic for over a week now. I've used it exactly as I do my Evo. I configured it the same as the Evo and in some cases with more extreme battery preserving (Ex: set the screen brightness to zero and only sync email every two hours (rather than the Evo's every hour)) and I can barely make it 14 hours, and that is a 14 hour DEAD stop.
Two other issues that are driving me crazy are the GPS and 3G performance.
It seems that when I'm sitting at home, the GPS will lock in about 10 seconds, but if I'm on the road in a random place (when I need the GPS the MOST) it will simply not lock if I'm driving and if I stop, it will eventually (maybe 5 minutes) lock.
3G performance has been absolutely horrible. I put the Epic right next to an Evo and TP2 and the Epic will get between 1/4th to 1/8th the throughput of the others. If I switch to Wifi, all is well and 4G is comparable (although not as reliable) to the Evo.
I am a keyboard person, the only thing wrong with the Evo was it did not have a keyboard. The Epic is exactly what I want, but these three strikes are making it tough to love. The 3G problem should be easy to fix with an update, as for the GPS and battery I don't know. I'm anxiously watching Sprint / Samsung to see if they will produce an update (see if they stand behind this product.)
BTW, at the end of a day, the number 1 battery culprit (according to the battery settings) is the display. With approx 1 to 1.5 hours of use at 0% brightness with an all black background, it still takes 50% to 65% of the battery (people posting that Super AMOLED saves battery over LCD are simply wrong.) The next offenders are Cell standby and phone idle. I was experiencing the 50% no signal problem, the workaround to cycle airplane mode helped that. But it does bring up another issue, although I have not had any call drops, the signal strength is consistently two bars (out of 6) lower than my Evo and TP2 (sitting right next to each other. At my home and in my office, my Evo and TP2 get 5 to 6 bars (full signal) but the Epic is 3 bars. I know the bars shown are not a good indicator and I don't have any dropped calls, but I wonder if this is not causing battery drain. This also makes me concerned that the main problem with this phone may not be solvable with software, it may be poor antenna design / implementation.
Click to expand...
Click to collapse
Wasn't SuperAmoLED supposed to be the wunderkid technology battery life saver? It seems not to be the case with these descriptions like yours. What gives? So it looks better than LCD but sucks just as much juice??

Battery life is getting better and better.

I haven't really done anything different, but my battery life in the past few weeks has just gotten better and better.
Right now it's 3pm. I put in a fresh battery at 9pm last night. Batt level: 55%. I was asleep for 7 out of those 18 hours, but I've had wifi and BT on the whole time. I've read and replied to 15 emails, maybe 10 texts, 15 min of calls, surfed the web for 2 hours, played about 30min of games, and had music streaming for 1.5 hrs. I've easily been making it through long work days (8am-8pm) of moderate/heavy use, whereas before I would need to recharge after 6-8 hours.
Anyone else noticing better battery life after the first few weeks? (of course, it might have to do with the fact that I'm playing with it less, but there are days when I play with it constantly and it's still doing better than 12+ hours)

I'm still on the first week with my current vibrant and I have noticed a slight improvement in battery life since I first got it--the fact that my life is pretty consistent day to day (phone-wise) helps me track it. Maybe the hardware and software need to be 'broken in' per-se?

Kubernetes said:
... I've easily been making it through long work days (8am-8pm) of moderate/heavy use, whereas before I would need to recharge after 6-8 hours.
...
Click to expand...
Click to collapse
Yeah, it does get better, but 12 hours is not good enough nowadays -- if you go to dinner after work, the battery will be dead before you get home.
This is my biggest gripe about the Galaxy S -- compared to my old iPhone 3Gs the battery life just sucks.
I am hoping that the efficiencies that come with Froyo will squeeze a few more hours and make it usable for a full day.
If Samsung gets off its lazy (or incompetent) butt and upgrades us to Froyo soon, of course.

MacGuy2006 said:
Yeah, it does get better, but 12 hours is not good enough nowadays -- if you go to dinner after work, the battery will be dead before you get home.
This is my biggest gripe about the Galaxy S -- compared to my old iPhone 3Gs the battery life just sucks.
I am hoping that the efficiencies that come with Froyo will squeeze a few more hours and make it usable for a full day.
If Samsung gets off its lazy (or incompetent) butt and upgrades us to Froyo soon, of course.
Click to expand...
Click to collapse
I can get close to 36 hours from mine, not sure what you guys are doing.

lralexl said:
I can get close to 36 hours from mine, not sure what you guys are doing.
Click to expand...
Click to collapse
The question is, what are you not doing? We can all get it to last the long, but this is a smart phone. I cannot afford to treat it like if I was stranded on an island.

Before I get into my post I just wanted to say I'm running stock out of the box with no root/ROM/etc. Just plain ol vanilla Eclair...with the JI5 via Kies.
I'm getting about 32 hours myself. I do use tasker to set up profiles only to turn things on when I want them. Such as sync will only be enabled for specific apps when I run them then off when I close them. GPS is only on when I run Maps/Yelp/any geo-aware app then it turns itself off. Turn on silent mode/vibrate when I'm at the office by recognizing specific cell towers...stuff like that.
I also disabled "Use Wireless Networks" under Location & Security since Google says it will use it even when the phone is off. I don't know why but it's been saving on battery too. I also don't use any task killing app such as ATK since I think the phone should be smart enough to manage the memory by itself.
edit: Oh, I use automatic brightness settings too with manual brightness control on the browser (usually on low-med setting)

Mark271 said:
The question is, what are you not doing? We can all get it to last the long, but this is a smart phone. I cannot afford to treat it like if I was stranded on an island.
Click to expand...
Click to collapse
Everything enabled except brightness. i turn off wifi and bluetooth when sleeping, and have sync set to once an hour for social contacts and such. For facebook etc i manually update my feed when i want to check on it, or it auto updates every hour.

Kubernetes said:
I haven't really done anything different, but my battery life in the past few weeks has just gotten better and better.
Right now it's 3pm. I put in a fresh battery at 9pm last night. Batt level: 55%. I was asleep for 7 out of those 18 hours, but I've had wifi and BT on the whole time. I've read and replied to 15 emails, maybe 10 texts, 15 min of calls, surfed the web for 2 hours, played about 30min of games, and had music streaming for 1.5 hrs. I've easily been making it through long work days (8am-8pm) of moderate/heavy use, whereas before I would need to recharge after 6-8 hours.
Anyone else noticing better battery life after the first few weeks? (of course, it might have to do with the fact that I'm playing with it less, but there are days when I play with it constantly and it's still doing better than 12+ hours)
Click to expand...
Click to collapse
I'm at a point of consistent battery life of about 13 hours of moderate to heavy use. Been this way since about the middle of August. The longest I've pushed it was close to 21 hours but i'm normally in the 11-12 range.
Glad your phone is leveling out though

Kubernetes said:
I haven't really done anything different, but my battery life in the past few weeks has just gotten better and better.
Right now it's 3pm. I put in a fresh battery at 9pm last night. Batt level: 55%. I was asleep for 7 out of those 18 hours, but I've had wifi and BT on the whole time. I've read and replied to 15 emails, maybe 10 texts, 15 min of calls, surfed the web for 2 hours, played about 30min of games, and had music streaming for 1.5 hrs. I've easily been making it through long work days (8am-8pm) of moderate/heavy use, whereas before I would need to recharge after 6-8 hours.
Anyone else noticing better battery life after the first few weeks? (of course, it might have to do with the fact that I'm playing with it less, but there are days when I play with it constantly and it's still doing better than 12+ hours)
Click to expand...
Click to collapse
Nah it's not any different from when you first bought it, you're just using it less, even though you think you are using it the same.
Trust me, when people buy a new phone, the first few days or couple weeks they can't take their fingers off the phone, and it appears battery sucks. As you get over your new toy phase, you don't play with it as much, and magically you think the battery has grown new cells.
bye.

MacGuy2006 said:
Yeah, it does get better, but 12 hours is not good enough nowadays -- if you go to dinner after work, the battery will be dead before you get home.
This is my biggest gripe about the Galaxy S -- compared to my old iPhone 3Gs the battery life just sucks.
Click to expand...
Click to collapse
There are easy ways to take care of this if you really need better battery life. First, call T-Mobile and complain that battery life is shorter than advertised. They'll walk you through a script and send you a free spare battery. Second, get an external battery charger. They're all over ebay for about ten dollars, and most come with generic spare batteries.
I've now got a charger and three batteries, so I can pretty much make it through an entire work week without worrying. (You couldn't do that with a 3GS!)

Kubernetes said:
There are easy ways to take care of this if you really need better battery life. First, call T-Mobile and complain that battery life is shorter than advertised. They'll walk you through a script and send you a free spare battery. Second, get an external battery charger. They're all over ebay for about ten dollars, and most come with generic spare batteries.
I've now got a charger and three batteries, so I can pretty much make it through an entire work week without worrying. (You couldn't do that with a 3GS!)
Click to expand...
Click to collapse
Are you serious?!
You really like carrying a pocketful of spare batteries?
I have 2 spare batteries, but I pack them only when I travel.
The damned phone should be able to last throughout a full day (meaning 16 or so hours) without having to worry about turning features off or limiting your calls and mail checking).
I never had to even think about the battery with my iPhone 3Gs.

you must really be glued to your phone if you can't make it a full day

lolcopter said:
you must really be glued to your phone if you can't make it a full day
Click to expand...
Click to collapse
Uhm, I am actually using it exactly the way I used my iPhone, and the way I need to use to do my work.
It just has crappy battery life
What are you comparing it to? A WM6 phone or something?

lralexl said:
I can get close to 36 hours from mine, not sure what you guys are doing.
Click to expand...
Click to collapse
I get nice battery life but I use it too much, then "a day" is from 5am to 10pm, it's just too useful, and when you check usage, it's 75% display.
36 hours would be easy if I limited my screen on-time....while I would like a UV kernel it's likely not helping enough. My display is on lowest, yet I'd love a lower setting.
Aside, the more background services check stuff while screen is off, battery life hours down.
Overall, I am VERY happy with the battery life.
Sent from my Vibrant.

MacGuy2006 said:
Are you serious?!
You really like carrying a pocketful of spare batteries?
I have 2 spare batteries, but I pack them only when I travel.
Click to expand...
Click to collapse
Um, the batteries are pretty small and skinny. Are you wearing pants with no pockets or something? Seriously, the thing can almost fit in the coin pocket of some jeans.
The damned phone should be able to last throughout a full day (meaning 16 or so hours) without having to worry about turning features off or limiting your calls and mail checking).
Click to expand...
Click to collapse
Should? Says who? The phone is pretty average for its class. You can either complain that things are not the way you want them, or you can adapt by carrying around a diminutive spare battery.
I never had to even think about the battery with my iPhone 3Gs.
Click to expand...
Click to collapse
You must be one of the few 3G/3GS users to never worry about battery life. Most of the users I know have (or had) to recharge mid-day, a pain in the butt since the battery is not removable. Your 3GS has a much slower processor/GPU, and a smaller screen with a quarter of the pixels; but even then, google "iphone 3gs battery life" and you'll get page after page of reviewers and users complaining about the abysmal battery life.
(of course, someone here claims that his Vibrant can go 40+ hours, so maybe your iPhone is a similar outlier.)

SamsungVibrant said:
Nah it's not any different from when you first bought it, you're just using it less, even though you think you are using it the same.
Trust me, when people buy a new phone, the first few days or couple weeks they can't take their fingers off the phone, and it appears battery sucks. As you get over your new toy phase, you don't play with it as much, and magically you think the battery has grown new cells.
bye.
Click to expand...
Click to collapse
Its exactly what the problem is. When I flash a new rom I spend 30minutes getting back to the way I like it and my battery suffers from it. When I actually use my phone like its intended to be used I get great battery life.

Are you using any kind of ROMs? I think some ROMs greatly improves battery life.

Kubernetes said:
...
Should? Says who? The phone is pretty average for its class. You can either complain that things are not the way you want them, or you can adapt by carrying around a diminutive spare battery....
Click to expand...
Click to collapse
Only a true nerd....
I wear skinny jeans.... ))
Kubernetes said:
...You must be one of the few 3G/3GS users to never worry about battery life. Most of the users I know have (or had) to recharge mid-day, a pain in the butt since the battery is not removable. Your 3GS has a much slower processor/GPU, and a smaller screen with a quarter of the pixels; but even then, google "iphone 3gs battery life" and you'll get page after page of reviewers and users complaining about the abysmal battery life.
(of course, someone here claims that his Vibrant can go 40+ hours, so maybe your iPhone is a similar outlier.)
Click to expand...
Click to collapse
Dude, I've had one iPhone 2G and two iPhone 3Gs. I also have two Galaxy S variants (international and a Vibrant).
There is no comparison between the iPhone 3Gs and the Galaxy S in terms of battery life. With the same kind of usage, the iPhone 3 Gs would last about 32-37 hours, while the Galaxy S would last about 12-13.
Even the iPhone 2G lasted about 18-20 hours. Now, compared to my previous HTC WM6 and WM6.5 phone, the Galaxy S does have longer battery life, but that's nothing to be so proud of.
The Galaxy's screen is certainly better than the 3Gs's, but the Super AMOLED is supposed to be more efficient than the LCD on the iPhone. Plus, in real world use, the iPhone 3Gs certainly feels smoother than the Galaxy S, even with the lag fix, and scrolling on the iPhone is smooth as butter, while the Galaxy S is choppy.
And it's not just the OS, because the EVO scrolls noticeably smoother than the Galaxy S.

I consistently get 20+ hours out of one charge. I can't really use my phone at work, but during breaks and lunch I'm always getting on it and checking mail/feeds/youtube or whatever and still have about 70% by the time I go home. I usually have more than half by the time I go to bed unless I've been doing some tethering or heavy audio/video streaming.

SamsungVibrant said:
Nah it's not any different from when you first bought it, you're just using it less, even though you think you are using it the same.
Trust me, when people buy a new phone, the first few days or couple weeks they can't take their fingers off the phone, and it appears battery sucks. As you get over your new toy phase, you don't play with it as much, and magically you think the battery has grown new cells.
bye.
Click to expand...
Click to collapse
lol...thats so true...

How to get 36 hours on 1 charge

Alright, so I'm not a very heavy user on the phone but I've started getting 36 hours of use on my phone. I was blown the hell away! I usually would get a Max of up to 25 or 26 hours or so before this. Even then a full 10 hours extra is magnificent!
Here's what I've got going on:
Running MIUI 2.3.23 ROM with Bulletproof Add On pack
Using Tiamat 1.1.5 kernel
Juice Defender Plus on Advanced mode
Recaibrated my batter with Battery Callibrator app
Overclocking at 1039 MHz and underclocking at 184 mhz using SetCPU
After calibrating my battery I let the battery run out completely a couple of times and voila!
I took a screenshot of my usage statistics but I can't find the damn thing now. I guess you're just got to trust me on this. This was definitely worth sharing.
All the best!
Sent from my HTC Desire Z using XDA

How many hours of screen on time did you have at the end of that charge? The longest battery life i've ever had for my phone was actually 3 days and 3 hours with 5 hours of screen on time. I'm a light to moderate user and i achieved that result with CM7.2 RC1 without any tweaks.
I really like the look of MIUI but i don't find it to be as fast as it really should be. I get frustrated by the scrolling lag that is present in the settings menu and the fact that video playback is much slower in comparison to other ROMs. Web pages were also always SO much more laggy in MIUI for me than on Sense or AOSP based ROMs. That's my personal experience, i think i've just about given up on MIUI and Sense based ROMs. I haven't touched either of those for a while now.

I get 36 hours normally with the stock Sense 2.1 ROM and Unity V10 kernel. Overclocked to 1Ghz with the standard governor.
I use it quite lightly though, 10 to 20 SMS, bit of internet / Facebook and 30 mins FM radio in the morning. Also accounts sync automatically, mail picked up every hour, data always on. That was with the stock battery, with the Anker 1600 mah I get to 36 hours with about 30% to spare!
On a side note, underclocking below 245Mhz has been know to cause problems. Standby of Death (or Sleep of Death), and possibly dropped SMS etc.
Craig

craiglay said:
I get 36 hours normally with the stock Sense 2.1 ROM and Unity V10 kernel. Overclocked to 1Ghz with the standard governor.
I use it quite lightly though, 10 to 20 SMS, bit of internet / Facebook and 30 mins FM radio in the morning. Also accounts sync automatically, mail picked up every hour, data always on. That was with the stock battery, with the Anker 1600 mah I get to 36 hours with about 30% to spare!
On a side note, underclocking below 245Mhz has been know to cause problems. Standby of Death, and possibly dropped SMS etc.
Craig
Click to expand...
Click to collapse
*sleep of death or SOD... i think S is for sleep not standby...
———————————————
i didn't mean to flame you, nor to mock you in any kind of way

thats quite insane @[email protected];;
i get about 13~15 hours of charge each time @[email protected];;
i use my phone mainly for texting and emails
no games on the phone...
i should give that a try, thats quiet insane ;o

lil-devil said:
thats quiet insane @[email protected];;
i get about 13~15 hours of charge each time @[email protected];;
i use my phone mainly for texting and emails
no games on the phone...
i should give that a try, thats quiet insane ;o
Click to expand...
Click to collapse
Hehe the word you're looking for is "quite" and not "quiet(as in low sound)".

Ace42 said:
Hehe the word you're looking for is "quite" and not "quiet(as in low sound)".
Click to expand...
Click to collapse
woops typo

magic_android said:
How many hours of screen on time did you have at the end of that charge? The longest battery life i've ever had for my phone was actually 3 days and 3 hours with 5 hours of screen on time. I'm a light to moderate user and i achieved that result with CM7.2 RC1 without any tweaks.
I really like the look of MIUI but i don't find it to be as fast as it really should be. I get frustrated by the scrolling lag that is present in the settings menu and the fact that video playback is much slower in comparison to other ROMs. Web pages were also always SO much more laggy in MIUI for me than on Sense or AOSP based ROMs. That's my personal experience, i think i've just about given up on MIUI and Sense based ROMs. I haven't touched either of those for a while now.
Click to expand...
Click to collapse
I'm not sure how much screen on time I had. I'll give it a check next time I'm monitoring my performance.
Sense UI has been a pain for me from the moment I started. I tried CM 7 but it had a bug where it wouldn't vibrate when I got a message unless it was in silent mode. Since I SMS quite a bit, it was quite annoying. I tried a couple of Virtuous ROMs too but they were glacial in their speed. Couldn't stand the lag.
I find MIUI to be the perfect balance between features, UI and speed. It might be a tad laggy in some places, but on the whole, it looks great, works great and doesn't give me problems in the parts I use the most. It doesn't seem quite as laggy with me as you seem to describe it. But anyhoo, for the first time since I bought my DZ, I feel like I have a good phone that I can rely on.
Thanks for your comments, man.

craiglay said:
I get 36 hours normally with the stock Sense 2.1 ROM and Unity V10 kernel. Overclocked to 1Ghz with the standard governor.
I use it quite lightly though, 10 to 20 SMS, bit of internet / Facebook and 30 mins FM radio in the morning. Also accounts sync automatically, mail picked up every hour, data always on. That was with the stock battery, with the Anker 1600 mah I get to 36 hours with about 30% to spare!
On a side note, underclocking below 245Mhz has been know to cause problems. Standby of Death, and possibly dropped SMS etc.
Craig
Click to expand...
Click to collapse
WOw! Really? Stock giving 36 hours! That's pretty sweet man. Never happened to me.
And thanks for the advice on the underclocking. Maybe I should up it a notch, just in case.

lil-devil said:
thats quite insane @[email protected];;
i get about 13~15 hours of charge each time @[email protected];;
i use my phone mainly for texting and emails
no games on the phone...
i should give that a try, thats quiet insane ;o
Click to expand...
Click to collapse
Go for it bro! And let me know if it works for you.
Right now, I've already hit 33.5 hours and have just hit 15% battery. And this is including a few games of Angry Birds. woohoo!

lunarplexus said:
After calibrating my battery I let the battery run out completely a couple of times and voila!
Click to expand...
Click to collapse
Letting the battery drain to shutdown is not a good idea. Not good for long term life of Li ion batteries. Also, its unlikely, but possible that draining to shutdown will render the battery unable to take a charge. Fail safes on the device and battery are supposed to prevent this in theory, but in reality they don't always work. Several reports on this device of people that drained to shutdown, and then couldn't charge their battery.
The battery meter is not accurate enough to necessitate draining to zero. Just drain to 10 or even 20%, charge to full, repeat a couple times. No value added whatsoever to draining to shutdown.
I have easily gotten 48 hours+ with light usage on various ROMs, including ILWT and Virtuous Unity (which is Sense 3, and claimed by some to be a "battery hog"). This is with Bluetooth and WiFi always on, and no special battery calibration or battery saving apps.. So many things affect battery life. But my personal hunch is that the ROM, clocking, radio, and data reception in your area (and of course usage) have more to do with battery life than other factors. And with radio and reception being the really big drivers.

That's definitely very helpful. I've always heard that rechargeable batteries are supposed to be drained completely and charged at least periodically to extend its life. Your proposition is contrary to this belief but then, I don't know that much about the battery and those aspects of the device itself to be able to refute what you're saying. Best to be on the safe side though.
Current record for my battery is 42 hours as of today. I'm pretty thrilled. My device was giving at least 10-15 hours less before I made these customisations. So I feel it probably has helped. However, there are a lot of factors at play, as you said.
Thanks for the response!

lunarplexus said:
That's definitely very helpful. I've always heard that rechargeable batteries are supposed to be drained completely and charged at least periodically to extend its life. Your proposition is contrary to this belief but then, I don't know that much about the battery and those aspects of the device itself to be able to refute what you're saying. Best to be on the safe side though.
Click to expand...
Click to collapse
There are various types of rechargeable batteries with very different behaviors. What you mention is known as battery conditioning, where you periodically drain to (nearly) empty and charge to full, and is recommended for older type NiCd (nickel cadmium) batteries. This is to avoid "memory effect" where the battery will remember how much was discharged in past cycles, and not deliver any more than demanded before. Kind of a "use it or lose it" principle.
Lithium (Li) ion cells (the type on most smartphones) do not suffer from memory effect. And full discharge cycles actually hurt the long term life of the battery. Charging frequently is actually the best for this type of bettery. But a couple nearly full cycles are needed to properly calibrate the battery meter on the phone.
If you want to educate yourself on the Dos and Don'ts of batteries, this website is a good one:
http://batteryuniversity.com/