I think there is a serious problem with my charging circuit on this phone. I have no idea if its hardware or software that is controlling the charging circuit but I can tell you that it literally takes forever to charge my phone via USB and this is unacceptable from a consumer standpoint.
I wanted to see how much current the phone was asking for and I was really surprised to see 96mA!!!
No wonder its charging so slow, something is really wrong here, and It doesnt look like a faulty battery. The phone should be asking for 10x this much current.
Can some people post how much current their phones are drawing from the usb port?
If you dont know how to do this, in "device manager" double click on the appropriate "usb root hub" that your phone is connected to and click on the "power" tab. Post results.
You are trying to charge your device on a pc correct?
Sent from my HTC Vision using XDA App
500mah is the max just about any phone will charge at from a usb port, at least without any modifications like fast charge drivers.
USB current, for charging purposes, is and always will be low. Otherwise you would burn up your motherboard. Alternatively it would let the magic smoke out of your phone and it would quit working properly.
Sent from Bonsai 6
+1 to the two posts above me. I suggest getting a wall adapter for your usb and charging it there, you will get vastly superior charging times
Sent from my HTC Vision using XDA App
Top Nurse said:
USB current, for charging purposes, is and always will be low. Otherwise you would burn up your motherboard. Alternatively it would let the magic smoke out of your phone and it would quit working properly.
Sent from Bonsai 6
Click to expand...
Click to collapse
USB current, for charging purposes, should be and always be 500mA. 96mA is not enough to charge one of these phones. You cannot burn up your mother board if the device calls for more than 500mA, as that is all that is available for each usb port.
Ive connected three of my old phones and an EVO and a mytouch Slide, they all ask for the maximum allowed current as they should. I do have a wall charger and it charges fine, Im trying to see if everyone else has the same USB charging problem as me, or if I have a broken phone, or if I just have some bad software on my phone.
Please if anyone can post results it will be helpful.
Hello again,
My G2 is asking for 500ma
Sent from my overclocked G2
PaganAng3l said:
Hello again,
My G2 is asking for 500ma
Sent from my overclocked G2
Click to expand...
Click to collapse
thanks but can you please post results for the an EPIC 4G phone?
Connected to a PC USB port, the Epic 4G will only draw 380ma. Via a wall charger is will only draw 600ma. Hence why charging on a PC is slower. Simple as that.
I also show exactly 96 mA, regardless of which USB port I am plugged into. Practically new motherboard, so I know the USB current isn't an issue. New Blackberry USB cable (far superior to stock Samsung cables).
IIRC, 500ma is the max draw per hub, not USB port. This is why people get powered add on hubs so they can have components that take more draw than a computer USB port will give.
Sent from Bonsai 6
Top Nurse said:
IIRC, 500ma is the max draw per hub, not USB port. This is why people get powered add on hubs so they can have components that take more draw than a computer USB port will give.
Sent from Bonsai 6
Click to expand...
Click to collapse
500Ma is NOT the per 'hub' power supplied, 500Ma is the PER PORT current max. EACH port on the motherboard will supply up to 500Ma, trying to draw more will not work. It won't burn it out, it just won't supply any more than that. If you have 8 ports on your MOBO, you will get a total of 4A of current in total, not exceeding 500Ma per port. If you hookup an UNPOWERED hub to your mobo, the total draw still cannot exceed the 500Ma. If the hub is powered, it will provide 500Ma to each port on it, and draw virtually none from the MOBO.
This is why you see some external devices with dual USB cords, or a single with a Y. This is because it will combine the 500Ma from each port to power the device for up to 1A of current.
96Ma will not charge the phone, it's not even enough to power the phone while making a call.
How are you measuring your current draw? Try other USB devices. Wall charging takes between 2 and 3hrs to charge depending if the phone is on and its current draw for what it's doing.
Top Nurse said:
USB current, for charging purposes, is and always will be low. Otherwise you would burn up your motherboard. Alternatively it would let the magic smoke out of your phone and it would quit working properly.
Sent from Bonsai 6
Click to expand...
Click to collapse
Pretty much every USB host device I've used can easily deliver 1A. Most new machines can deliver 2A (such as ASUS boards and Macs) over USB. The Epic still charges way too slowly even off a wall charger. It'd be nice if it drew 1A instead of ~600mA. Most other devices use much higher charge currents when plugged into AC.
As for the Epic's charge current, I think the USB driver on it just reports charge current incorrectly.
Orbiting234 said:
Connected to a PC USB port, the Epic 4G will only draw 380ma. Via a wall charger is will only draw 600ma. Hence why charging on a PC is slower. Simple as that.
Click to expand...
Click to collapse
thanks to the two people, that haven't been derailing this thread into a "how usb ports work discussion".
if anyone wants to help instead of arguing over how usb ports work, it would be really helpful to know what rom and kernel you are using when you tested your epic 4g device.
Im especially interested to know this information about orbiting who is getting 380mA. Im also interested in how you measured measured the 600mA from the wall charger.
Its posted at the end of the OP how to see how much current your phone is asking for.
I think the charge controler on the Epic will alter the current draw depending on how close it is to fully charged . Once it gets above about 90% charge the current should taper off. this is to prolong the battery life.
The Normal charging times starting at about 30% is under 3 hours on a wall charger for me. I can go from about 70% to 100% om my laptop in about an hour.
poit said:
I think the charge controler on the Epic will alter the current draw depending on how close it is to fully charged . Once it gets above about 90% charge the current should taper off. this is to prolong the battery life.
The Normal charging times starting at about 30% is under 3 hours on a wall charger for me. I can go from about 70% to 100% om my laptop in about an hour.
Click to expand...
Click to collapse
I already know this, and its not what I asked for.
poit said:
I think the charge controler on the Epic will alter the current draw depending on how close it is to fully charged . Once it gets above about 90% charge the current should taper off. this is to prolong the battery life.
The Normal charging times starting at about 30% is under 3 hours on a wall charger for me. I can go from about 70% to 100% om my laptop in about an hour.
Click to expand...
Click to collapse
mrhocuspocus said:
I already know this, and its not what I asked for.
Click to expand...
Click to collapse
I appologize for wasting your time, but let me elaborate.
Right now my phone is at 89% charge, and right now the "Power Required" field in the USB root properties is showing 96 ma. I doubt that is an actual measured current, more likely it's what the port controller on the Epic reports as a minimum current required. What I can tell you is that even with that info, my phone charges fine. Seems unlikely that it's only supplying 96ma because I'd expect the phone must draw 40 ma or so just to idle.
What would be more useful would be an app on the phone that polled the charge controller to give us actual voltage and current data. I had one on my old TP2 that was great, but I don't know about one for Android.
Edit: in the time it took to type this reply the State of Charge went from 89 to 92%, yet the properties still shows 96 ma. I think the controller is getting way more than 96ma, so that number is likely bogus.
I guess that wasn't what you asked for either, but maybe it is stilll useful
poit said:
the USB root properties is showing 96 ma. I doubt that is an actual measured current, more likely it's what the port controller on the Epic reports as a minimum current required.
I guess that wasn't what you asked for either, but maybe it is stilll useful
Click to expand...
Click to collapse
no need to apologize, I could explain to you why what you think is "more likely" is actually less likely. but it would only further derail this thread. feel free to pm me if you are interested.
all im interested in is three things:
current asked for by phone from pc usb, rom version, and kernel version.
someone already reported 380mA. but i have no idea what software he is on.
I'm running completely stock EB13. On my newer laptop with Windows 7 it shows 96mA in the device manager. On my ancient Dell PC at work running XP, it shows 96mA as well. In both cases I'm plugging the phone directly into a USB port, no external hubs.
xxmastermindxx said:
I also show exactly 96 mA, regardless of which USB port I am plugged into. Practically new motherboard, so I know the USB current isn't an issue. New Blackberry USB cable (far superior to stock Samsung cables).
Click to expand...
Click to collapse
I'm running the latest Syndicate 1.0.1 with their latest 1.0.3 kernel. My quote above is when I was running Syndicate 1.0.0 and kernel 1.0.1.
If I go back to stock for some reason, I'll post those numbers up too.
Sent from my SPH-D700 using XDA Premium App
Related
Hey! Guys I am having problems with the USB Charging, it seems to drain the 100% charged battery quicker (while using the phone, unplugged NOT charging) like one day and I have to charge the phone again, But when i charge my phone (100% charge) using the wall charger my phone lasts two and a half days. My wife also said she experiences the same thing with USB charged HTC Trinity Phone. I have tried on different computers and laptops as well but still the same and i know that USB charging will take longer to charge (500mah) so i leave the phone over night like 9 hours but the phone drains like juice. What kind of a Phenomenon is this.. Guys i need your humble thoughts and solutions on this because this is becoming a big problem for me since i use USB charging mostly... Plus I am not a very hardcore app, wifi or games user on the phone either... Darn...
same problem
I don't know why but i meting with the same problem. No idea why this happening it should be same from electric perspective.
When the phone cahrges via computer USB, the phone charges at a rate of around 90mA due to the phone running. Try with the phone off
Tried that as well, but it seems to be the quite the same but little difference since it last a little longer but still drained out in one freakin day. I am pulling my hair off because of this problem.. darn why is this just so... i mean like in the second post the process should be electronically identical right. only difference is it takes more time to charge from USB.... Grrrrr!
my phone hardly last one day..How do you make it last for 2 1/2 days?
xiyan2127 said:
Tried that as well, but it seems to be the quite the same but little difference since it last a little longer but still drained out in one freakin day. I am pulling my hair off because of this problem.. darn why is this just so... i mean like in the second post the process should be electronically identical right. only difference is it takes more time to charge from USB.... Grrrrr!
Click to expand...
Click to collapse
Battery indicators do lie.
it all depends upon if your board can deliver enough current to run the phone and charge it. on my rig i see no difference between wall charger and laptop or desktop charging
the laptop is a studio 15 with an i5 and h55 chipset and the desktop is a core 2d machine with a p45 series chipset.
you can tell the phone to disable usb charging if the phone is on while connected to usb to see if that helps (it will still charge via USB if the phone is off)
anhyeuemmaimai said:
it all depends upon if your board can deliver enough current to run the phone and charge it. on my rig i see no difference between wall charger and laptop or desktop charging
the laptop is a studio 15 with an i5 and h55 chipset and the desktop is a core 2d machine with a p45 series chipset.
you can tell the phone to disable usb charging if the phone is on while connected to usb to see if that helps (it will still charge via USB if the phone is off)
Click to expand...
Click to collapse
any usb not from china will give about 500mah, whether it be my i7 laptop or z550 vaio, so specific components shouldn't matter.
usb charges a little slower, but no reason it should not last as long once its got all the amps it can take. weird situation man...my huge list of htc phones never had an issue, and i do use a work computer to charge via usb sometimes
Thanks for your thoughts guys!!!
Weird... Yeah thats the thing i am also using a Core i7 930 CPU and my motherboard is ASUS ROG Rampage III Gene board, so i don't think my system is the problem here...
The wall charger delives 2 amperes to our HTC phones while usb ports delivery only 500mA (0,5 amperes). It's not only a matter of charging slower but you can't deliver the full charge the battery needs to revert the chemical process of discharging when tou use usb port. With 2amperes the charging process reachs it's maximum.
bravo261 said:
any usb not from china will give about 500mah, whether it be my i7 laptop or z550 vaio, so specific components shouldn't matter.
usb charges a little slower, but no reason it should not last as long once its got all the amps it can take. weird situation man...my huge list of htc phones never had an issue, and i do use a work computer to charge via usb sometimes
Click to expand...
Click to collapse
some cheap mainboards cannot supply even 500ma. a good qaulity board can supply more.
want to test it? put your HD2 in the first USB port and then put a high power device like a wireless dongle or external USB HDD in the second and see what happens. if your board cannot power both, you'll drop your wireless/hdd connection when you plug your phone in.
Phone Usage...
mbrown3460 said:
my phone hardly last one day..How do you make it last for 2 1/2 days?
Click to expand...
Click to collapse
Sir I have said that I am not a very heavy phone using guy, I am an average phone user. Plus I dont use the 3g or data connection here in my country since the connections are snail slow and prices are over the head and there is no unlimited data package here yet. I use the Wifi sometimes to update my twitter, Rss hub, facebook, weather tabs and very little market place... So my phone lasts for two and a half days when i use the wall charger.
Oh yeah and Guys, i tried recalibrating the battery by using it till the phone died completely and recharging it with USB (phone turned off) for like a day but still it drains faster than the wall charger rate.... I dont understand really...
Bicalho said:
The wall charger delives 2 amperes to our HTC phones while usb ports delivery only 500mA (0,5 amperes). It's not only a matter of charging slower but you can't deliver the full charge the battery needs to revert the chemical process of discharging when tou use usb port. With 2amperes the charging process reachs it's maximum.
Click to expand...
Click to collapse
This is why. The awnser was given, but people ignored it. To fully charge a battery it needs more amperes. Use the wall charger. The battery indicator lies, and is unable to acuratly measure a fully charged battery. It'll display 100% when it's roughly 70%.
Our batteries use Lithium ions as means of electricity. They use a Lithium compound, and move the ions from the negative to the positive pole. When there are no more ions to move, our batteries are discharged. When we connect to an external power source, the higher voltage will draw the ions back to the "negative pole".
USB supplies 500 mA (that's 0.5A) @ 5V (per specification, some motherboards won't be able to go that high, depending number of USB devices connected, etc)
European electrical sockets supply up to 2.5A @ 230V and although your HTC charger should only output 1A @ 5V, the topping off will occur much quicker.
Basically the more you have to charge, the more time it takes, and the bigger the effort on the current to pull the remaining ions back to the negative pole.
I am finding that in Android, my phone will not charge with either wall or usb charging. The phone shows that it is charging but does not actually charge. This is really unacceptable. It works in Windows Mobile but is not a listed problem of the Android builds. Are all of you using WM6.5 or Android? Or both?
jaylc said:
I am finding that in Android, my phone will not charge with either wall or usb charging. The phone shows that it is charging but does not actually charge. This is really unacceptable. It works in Windows Mobile but is not a listed problem of the Android builds. Are all of you using WM6.5 or Android? Or both?
Click to expand...
Click to collapse
I can Charge my HD2 well on both OS's but still when compared to android and WinMo when i use the USB Android does discharge heavily than WinMO and Android does the same when compared to WinMO on wall charger use as well... So nothing much more to say at that...
Charging mobiles using USB takes alot longer than using power outlet and this is valid for all kind of mobiles, ALSO when you charge by USB your mobiles battery drains much faster than charging from power outlet. (Electrical Engineers say so).
NOW why you don't use power outlet to charge your HD2 rather than using USB?
There are safety measures in charging from USB like, static issues from wall charger in some countries and then there is the ease of use from charging from PC while you are at work or away on a business trip..
mbrown3460 said:
my phone hardly last one day..How do you make it last for 2 1/2 days?
Click to expand...
Click to collapse
Mine lives for 5 days on just 1 charge, and with normal use (every 2/3 hours updating weather and twitter, sometimes call, sometimes texting, sometimes using internet)
Is it alright to have the SGT plugged into a USB port all day (approx 9hrs) ? I'd like to have it keep its charge (maybe even gain a little) while I'm at work so I can have a decent amount of juice for the trip home and until i go to bed. Or is this a good way of burning out my battery real quick? Thoughts?
Oh and as a side note on USB charging, I was able to get from 15% to 99% in 7hrs with the screen off the whole time.
Is it a slow-charging USB port? Or is it a powered hub? If I'm not mistaken, slow-charging a lithium-ion based battery pack is actually better for its life as opposed to rapid charging.
Its the regular port on the PC not even high speed usb so i guess it isn't powered.hmm guess the charging part is OK..but what about leaving it plugged all day even if the battery is at 100%?
Sent from my GT-P1000 using XDA App
All usb ports are powered by definition. They can supply up to 500ma (half an amp). Dont worry about leaving your tab plugged in, devices are smart enough these days not to overcharge the battery.
Sent from my GT-P1000 using XDA App
TheCoda said:
All usb ports are powered by definition. They can supply up to 500ma (half an amp). Dont worry about leaving your tab plugged in, devices are smart enough these days not to overcharge the battery.
Sent from my GT-P1000 using XDA App
Click to expand...
Click to collapse
Coda is right, technically they all have power . If not, how would any device charge? I guess I really meant to say USB ports charge at a higher MA or something for rapid charging (wall-socket USB adapters?).
Also, Coda is right again. Devices these days are fairly smart. I typically leave my HD2 plugged in all the time with no problems.
itll be just fine plugged in!
ive been part-charging mine at random intervals (sometimes for 20 mins at a time a few times a day) and leaving it charging over a day from both powered hub and charger over about five months... though i have had two or three near total discharges
the battery has got better, which is what you would expect from the tech - sammy even provides a nice notification telling you the device is fully chraged
i wonder if they put that in there to account for unexpected battery problems down the line? in any case, ive read that low-powered charging, even unregistered by the battery, will increase the lifetime of the battery and also charge at approximately the same rate... ive seen this with my phones charging over pc usb
Great! Nothing to worry about then. The tab would look really cool on my office desk sporting the same screensaver as my PC ..'the Matrix' scrolling code.
I think it is OK. I bought a 2d adapter, one for the office. Since Sammy is selling docks, it also means that it can be powered all times. On the other hand I remember my Archos which I used to leave it on its dock all times... battery was killed in a short time. When you sell multimedia charging docks it means that you can leave it there, no? Not in the case of Archos.
why? why did motorola use a proprietary charging cable? it would of been so nice to have a micro usb cable to charge the xoom. im very worried one day that needle proprietary cable going to break and it wont charge my xoom anymore.
it seems like motorola is a HUGE fan or proprietary cables, especially the v60 series flip phones.
fondoo said:
why? why did motorola use a proprietary charging cable? it would of been so nice to have a micro usb cable to charge the xoom. im very worried one day that needle proprietary cable going to break and it wont charge my xoom anymore.
it seems like motorola is a HUGE fan or proprietary cables, especially the v60 series flip phones.
Click to expand...
Click to collapse
All the latest tablets have proprietary cables...
fondoo said:
why? why did motorola use a proprietary charging cable? it would of been so nice to have a micro usb cable to charge the xoom. im very worried one day that needle proprietary cable going to break and it wont charge my xoom anymore.
it seems like motorola is a HUGE fan or proprietary cables, especially the v60 series flip phones.
Click to expand...
Click to collapse
Simple, many recent tablets use proprietary cables to allow higher current and faster charge times.
The average usb cable hooked up to your pc provides about 500mA
The proprietary cable for a modern tablet like the XOOM can deliver around
1.5A
With a micro USB cable it would take forever to charge the XOOM. Then people would be complaining about why the XOOM takes so incredibly long to charge, and bashing motorola for the problem. Instead Motorola chose to do it the intelligent way, by separating the charge function to a proprietary cable to allow very fast charging, and including the usb cable for data transfer.
When I see a proprietary cable I don't think - crap why do they do it this way. Instead I think wow great, that means this thing was designed for fast charges.
Digital Man said:
Simple, many recent tablets use proprietary cables to allow higher current and faster charge times.
The average usb cable hooked up to your pc provides about 500mA
The proprietary cable for a modern tablet like the XOOM can deliver around
1.5A
With a micro USB cable it would take forever to charge the XOOM. Then people would be complaining about why the XOOM takes so incredibly long to charge, and bashing motorola for the problem. Instead Motorola chose to do it the intelligent way, by separating the charge function to a proprietary cable to allow very fast charging, and including the usb cable for data transfer.
When I see a proprietary cable I don't think - crap why do they do it this way. Instead I think wow great, that means this thing was designed for fast charges.
Click to expand...
Click to collapse
THANK YOU lol finally someone that understands.....
plus, the input voltage in to the tab is 12v, hard to get 12v from a 5v USB supply...
For a bit more info, I too wondered about USB charging. The limit seems to be when the Xoom is running, the current drain can be upwards of 400 mA so I could see a situation where a USB charger at 500 mA would overload if you did too much on the Xoom during charging. That would be good enough reason to avoid that design mess. "Do not use during charging" would not be sufficent protection. The Moto Mains Charger manages 1500 mA for a couple of hours which is wonderful. Now if only I could charge my Nexus S that quickly
xtkxhom3r said:
THANK YOU lol finally someone that understands.....
Click to expand...
Click to collapse
right? about time
I am really glad that trickle charging is not possible with the Xoom, saves a lot of problems...I just wish they had used a different connector for the power. Something a bit more durable and commonly included in third party multichargers would have been nice...but one can't have everything.
I still support the seperate power cable choice for all kinds of reasons.
Sent from my GT-I9000 using XDA Premium App
Just amazes me that folks will complain about anything and everything. Good grief, it charges in no time and runs more than a day when it does. What more can you expect?
I like the idea of a separate charger, but the only thing I take issue with is the design of the charger it self. Luckily, I just set mine on the dock before bed. The dock doesn't use that flimsy pin, it uses the two gold plates at the bottom to charge.
Kcarpenter said:
I like the idea of a separate charger, but the only thing I take issue with is the design of the charger it self. Luckily, I just set mine on the dock before bed. The dock doesn't use that flimsy pin, it uses the two gold plates at the bottom to charge.
Click to expand...
Click to collapse
going to have to look into that dock cause i'm not to fond of the charger that it has. so the avg. use time is about a day, are you guys mod or heavy users(as you can tell i dont have mine yet ordered and waiting for it to show up)trying to get as much real world use info as i can
i love the proprietary cable. It is SOOO much faster. My Galaxy tab with a 4000 mAH battery took almost 4 hours to charge and i was lucky to get two days usage out of it (standby time and normal usage combined). My Xoom (no idea on mAH size) charges in 2 hours and i get 90 hours usage out of it (mainly standby but still a lot of screen on time, wiht a much larger and brighter screen to power). LOVE it.
Yeah I wouldn't worry about the Cable its seems durable, only thing I AM worried about was how you plug the wires all on the side of the device, I feel like there's abit of give on the wires when holding it sideways, I wish it was more like the iPad.
You know the first time I saw that the tablets used a seperate charging cable I was like, "why?" but then I stopped and think, there's no why a USB (let alone a micro-USB) can charge those suckers, so I'm personally glade that tablet makers did what they did and make it seperate.
I just wish they chose a 30-pin connector instead of this tiny one. The slightest mistake while it's charging (like say you trip over the cord), and there goes your xoom for repair/replacement.
Lets not rule out USB charging. Yes, I love going from 5% to 100% in about an hour. But I also have USB plugged in for hours on end when doing my thang. . That being said, we do not know for certain that USB charge is a hardware limitation. Yes, USB puts out 500mV. But I can tell the kernel to suck in whatever. If the hardware is capable, its doable.
I still think the option should have been given to us. Cuz many if not all of us have micro USB around. I for one only take a single micro USB in my pocket for my phone. So its would have Been nice to be able to charge both device with one charger. But I mean scull charge usually carry me all day. So I don't see it as a major problem right now.
Sent from my Xoom using XDA Premium App
bigrushdog said:
Lets not rule out USB charging. Yes, I love going from 5% to 100% in about an hour. But I also have USB plugged in for hours on end when doing my thang. . That being said, we do not know for certain that USB charge is a hardware limitation. Yes, USB puts out 500mV. But I can tell the kernel to suck in whatever. If the hardware is capable, its doable.
Click to expand...
Click to collapse
e
Its actually 500mA not 500mV. Usb provides 5 volts at 500ma for usb 2.0 and that will be picked up to 900ma in usb 3.0. Even with this in mind it isn't the biggest problem with stoppinh usb charging in the xoom. The issue I believe is in the fact that the current charger is 12 volts and 1.5 amps. That's more than twice the volts at tripl the amperes.
Even beyond the amperage issue charging a battery that is set up to input from a 12 volt source with a 5 volts supply, even if it was possible with existing xoom hardware it would take forever!
I wish there was a way to have both options available for charging. Use the USB if you have no access to a AC adapter, albeit, a slower charge.
It seems that there's a false dichotomy here; the options aren't only trickle charge by usb and wall adapter with the proprietary connection. What about a wall charge via the usb port? I don't see why the usb port couldn't be used for the charge. I can trickle charge my n1 or I can plug it into an outlet, which charges the phone much faster. I'm sure the xoom could have been designed to suck in more power when conected to an outlet.
The only plus with the proprietary port is that we can charge and have the xoom connected to a computer or peripheral at the same time.
So I realized that if I charge my phone using the USB ports on my laptop, the phones batter lasts much longer than if I charged it through the power outlet in the wall.
I didn't take any screenshots because I didn't think of it at the time, but through the laptop I got about 2 days and 14 hours with moderate use and I had 18% battery left.
Through the wall charger, I get about 18 hours with moderate use.
Can anyone else confirm?
Not sure, but i do feel that it charge slower on the USB port of my laptop. Maybe it have something to do with your theory.
Centranly!
USB port can give max 500mA but the wall charger can supply with 700mA (+40%!!!)
I have a charge-only cable that charges over my MBP's USB faster than any AC adapter I've tried. Charges last about the same regardless of power source though...
Sent from my MB860 using xda premium
emandt said:
Centranly!
USB port can give max 500mA but the wall charger can supply with 700mA (+40%!!!)
Click to expand...
Click to collapse
USB 2.0 will provide up to 500mA while USB 3.0 can provide 800mA. Stock Atrix wall charger I have is 850mA.
How do you verify what mA you're using? Is there a good tool for that?
CaelanT said:
USB 2.0 will provide up to 500mA while USB 3.0 can provide 800mA. Stock Atrix wall charger I have is 850mA.
Click to expand...
Click to collapse
IIRC, these are minimum specs for the standards. Could be wrong, but I believe that true output varies card to card/port to port.
Sent from my MB860 using xda premium
Plasmamuffins said:
So I realized that if I charge my phone using the USB ports on my laptop, the phones batter lasts much longer than if I charged it through the power outlet in the wall.
Click to expand...
Click to collapse
I've heard this theory before, but didn't see noticeable difference on my phone to back this claim.
I do agree with OP that charging the phone connected to a laptop USB port would give longer battery life. I have noticed this on several occasions already. I also agree the charge process would be much slower. With my phone, with 5% charge or less, the battery icon randomly doesn't animate while being charged.
That a side, I'm also sure something is broken in Atrix design, be it hardware, battery, or both but something is not right. I can't even charge my phone from a power point with the supplied cable and the plug [UK].
I know Motorola won't admit neither fix this problem in Gingerbread but might do, quietly, in ICS. One other possibility I can think of is that the supplied plugs are the culprit.
Today i charged the phone from my laptop, and im not feeling any difference at all. Its discharging at my usual pace. :/
Sent from my MB860 using XDA
Furthermore to my previous post, I have finally found the opportunity to test my phone with a Blackberry charger and it started charging the phone from the power point. That means the Motorola UK plugs I have are broken.
I'm arranging to purchase a Blackberry charger now. Don't want waste my time and money with Motorola anymore.
I have a Verizon Galaxy Tab 7.7 i815.
It's an amazing tablet for video playback because of the large AMOLED screen. Comparable to plasma screens.
So, the problem I have is that while it's great for this, it is also extremely picky on the charger. Basically, the only thing I can get to recharge this is with the Samsung usb charger that plugs into power.
It will not even charge from the computer.
And of course, it refuses to charge from portable power banks. This is kind of a big deal because the battery life of this tablet is pretty bad, so being able to use a power bank would be great.
Any idea why this is? How to fix? Maybe I just have a bad unit? What's going on?
taiwwa said:
I have a Verizon Galaxy Tab 7.7 i815.
It's an amazing tablet for video playback because of the large AMOLED screen. Comparable to plasma screens.
So, the problem I have is that while it's great for this, it is also extremely picky on the charger. Basically, the only thing I can get to recharge this is with the Samsung usb charger that plugs into power.
It will not even charge from the computer.
And of course, it refuses to charge from portable power banks. This is kind of a big deal because the battery life of this tablet is pretty bad, so being able to use a power bank would be great.
Any idea why this is? How to fix? Maybe I just have a bad unit? What's going on?
Click to expand...
Click to collapse
You need an adapter to charge with computer or battery or anything besides the stock charger. I was trying to find one on ebay without success. I will look again. The one I have is made by Pizen and was $2.
http://www.ebay.com/itm/FOR-Samsung...=Laptop_Adapters_Chargers&hash=item1c36f25bea
You need something like this.
Sent from my GT-P6810 using xda app-developers app
taiwwa said:
I have a Verizon Galaxy Tab 7.7 i815.
It's an amazing tablet for video playback because of the large AMOLED screen. Comparable to plasma screens.
So, the problem I have is that while it's great for this, it is also extremely picky on the charger. Basically, the only thing I can get to recharge this is with the Samsung usb charger that plugs into power.
It will not even charge from the computer.
And of course, it refuses to charge from portable power banks. This is kind of a big deal because the battery life of this tablet is pretty bad, so being able to use a power bank would be great.
Any idea why this is? How to fix? Maybe I just have a bad unit? What's going on?
Click to expand...
Click to collapse
Mine (a P6800) charges normally from USB (only with the screen off and charges VERY slowly, though; despite the battery icon showing an "X") and from my power bank. That power bank is chinese, got it from DealExtreme, and puts out 2A of current (the same as the stock charger). The battery icon also shows an "X" when charging from it, though.
Are you sure it doesn't charge? Or does it display an "X" but still charges when not in use?
Steve_max said:
Mine (a P6800) charges normally from USB (only with the screen off and charges VERY slowly, though; despite the battery icon showing an "X") and from my power bank. That power bank is chinese, got it from DealExtreme, and puts out 2A of current (the same as the stock charger). The battery icon also shows an "X" when charging from it, though.
Are you sure it doesn't charge? Or does it display an "X" but still charges when not in use?
Click to expand...
Click to collapse
Just for info.
The stock kernel will allow only USB charge at a rate of 450mA, regardless of a power bank or PC USB connection. Max AC is 1500mA.
my P6800/P6810 SkyHigh kernel will USB charge up to AC max (1500mA), using same device circuitry. The kernel is also modded to allow charging icon animation when connected to USB power source. This is because it thinks the source is AC. There are no System.UI.apk changes needed
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how do you install this?
taiwwa said:
how do you install this?
Click to expand...
Click to collapse
Sorry, the kernel will only work on P6800/P6810 devices (if that's what you're referring to). Was was info about charging rates...
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UpInTheAir said:
Just for info.
The stock kernel will allow only USB charge at a rate of 450mA, regardless of a power bank or PC USB connection. Max AC is 1500mA.
my P6800/P6810 SkyHigh kernel will USB charge up to AC max (1500mA), using same device circuitry. The kernel is also modded to allow charging icon animation when connected to USB power source. This is because it thinks the source is AC. There are no System.UI.apk changes needed
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Click to expand...
Click to collapse
AC max is 1.5A? Weird... The charger is good for 2A, and we've got more than enough battery to charge at 2A safely. Any way to increase the AC limit on your kernel, maybe configurable by a file/variable/etc?
And I'm pretty sure the device charges at more than 450mA from my power bank. Just checked, and realized that the charging icon appears normally (on stock 4.1 kernel). Galaxy Charging Current reports a 2A current on my S3 (Temasek kernel, adjusted for a maximum of 2000 mA on AC, 1200 mA on USB3 and 650 mA on USB2). Some power banks appear exactly like an AC charger as far as the USB connection is concerned.
Steve_max said:
AC max is 1.5A? Weird... The charger is good for 2A, and we've got more than enough battery to charge at 2A safely. Any way to increase the AC limit on your kernel, maybe configurable by a file/variable/etc?
And I'm pretty sure the device charges at more than 450mA from my power bank. Just checked, and realized that the charging icon appears normally (on stock 4.1 kernel). Galaxy Charging Current reports a 2A current on my S3 (Temasek kernel, adjusted for a maximum of 2000 mA on AC, 1200 mA on USB3 and 650 mA on USB2). Some power banks appear exactly like an AC charger as far as the USB connection is concerned.
Click to expand...
Click to collapse
Why weird? Is all in the P6800 kernel source code.... I've not mentioned SGS3 ....
Those apps may just detect the source input, not the actual charge rate limited by kernel. Big difference afraid.
If the P6800 stock kernel detects it being charged as USB, all you will actually get is max 450mA. Same goes for AC, may show the source input greater, but charging rate is limited to max 1500mA. You can see my kernel commits on gitHub and study for yourself.
Remember, those charging current apps while useful, do have a large degree of variance as well.
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UpInTheAir said:
Why weird? Is all in the P6800 kernel source code.... I've not mentioned SGS3 ....
Those apps may just detect the source input, not the actual charge rate limited by kernel. Big difference afraid.
If the P6800 stock kernel detects it being charged as USB, all you will actually get is max 450mA. Same goes for AC, may show the source input greater, but charging rate is limited to max 1500mA. You can see my kernel commits on gitHub and study for yourself.
Remember, those charging current apps while useful, do have a large degree of variance as well.
Sent from my GT-I9500 using XDA Premium 4 mobile app
Click to expand...
Click to collapse
Weird because the charger that comes with the P6800 is rated 2A, and the P6800 battery is big enough to charge at 2A and stay under 0.7C. There is no reason at all to limit the charge to only 1.5A, unless the circuitry won't handle that (which would be a bad screwup by Samsung). I just asked if it is possible to change this "hard" limit on your kernel. I didn't mention the I9300 on this point, only as an example of a device where this is adjustable on custom kernels (it's also adjustable on your I9500, by the way, check Perseus kernel).
Actually, that app detect the actual charge rate as limited by the kernel (on the I9300). That app doesn't work on the P6800, because the kernel doesn't output those values. On the I9300, some kernels allow you to configure the maximum input current (@5V, from the charger) and the maximum current output (@~4.35V, to charge the battery). But that is not important; my point was just that some power banks (like mine) have the exact same USB connection as a regular wall charger, so the phone/tablet/whatever sees it as a regular wall charger even on stock kernel. The OP could search for one of those, if his device charges normally from wall chargers it will charge from a power bank like this.
And BTW, Apple chargers are crap, they won't output full current unless they detect an Apple device. So, no Android/WP/etc will charge correctly from an Apple charger.
Steve_max said:
Weird because the charger that comes with the P6800 is rated 2A, and the P6800 battery is big enough to charge at 2A and stay under 0.7C. There is no reason at all to limit the charge to only 1.5A, unless the circuitry won't handle that (which would be a bad screwup by Samsung). I just asked if it is possible to change this "hard" limit on your kernel. I didn't mention the I9300 on this point, only as an example of a device where this is adjustable on custom kernels (it's also adjustable on your I9500, by the way, check Perseus kernel).
Actually, that app detect the actual charge rate as limited by the kernel (on the I9300). That app doesn't work on the P6800, because the kernel doesn't output those values. On the I9300, some kernels allow you to configure the maximum input current (@5V, from the charger) and the maximum current output (@~4.35V, to charge the battery). But that is not important; my point was just that some power banks (like mine) have the exact same USB connection as a regular wall charger, so the phone/tablet/whatever sees it as a regular wall charger even on stock kernel. The OP could search for one of those, if his device charges normally from wall chargers it will charge from a power bank like this.
And BTW, Apple chargers are crap, they won't output full current unless they detect an Apple device. So, no Android/WP/etc will charge correctly from an Apple charger.
Click to expand...
Click to collapse
Comparing kernels from different boards and CPU etc is like comparing apples and oranges.
If I could make the charge current configurable in my kernel, don't you think I would have already? Not everything is "cut and paste" and I expended allot of time in trying to port the mod for our current hardware.
Yeah, I've used just about all the kernels (at time of owing device) including perseus, siyah etc, do have good experienceI with configurable kernel charge. After using/having SGS2 x2, SGS3 x1, SGS4 x1 and SGT P6810 x1, it's not the first time I've heard of it.....
I won't be increasing max charge rate on the SkyHigh kernel above 1500mA. This generally increases battery heat and shortens lifespan.
On stock kernel + unmodified systemUI.apk for battery charge icons, if the kernel detects ANY charge source as USB, the max rate will be 450 mA. You will not see any battery charging animation (just the red x), which is a "sure fire way" to check.
In short, on our SGT-7.7, under stock conditions, if you connect ANY charging source and you DON'T have the battery charge animation, it will be USB charge at 450mA max.
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UpInTheAir said:
Comparing kernels from different boards and CPU etc is like comparing apples and oranges.
If I could make the charge current configurable in my kernel, don't you think I would have already? Not everything is "cut and paste" and I expended allot of time in trying to port the mod for our current hardware.
Yeah, I've used just about all the kernels (at time of owing device) including perseus, siyah etc, do have good experienceI with configurable kernel charge. After using/having SGS2 x2, SGS3 x1, SGS4 x1 and SGT P6810 x1, it's not the first time I've heard of it.....
I won't be increasing max charge rate on the SkyHigh kernel above 1500mA. This generally increases battery heat and shortens lifespan.
On stock kernel + unmodified systemUI.apk for battery charge icons, if the kernel detects ANY charge source as USB, the max rate will be 450 mA. You will not see any battery charging animation (just the red x), which is a "sure fire way" to check.
In short, on our SGT-7.7, under stock conditions, if you connect ANY charging source and you DON'T have the battery charge animation, it will be USB charge at 450mA max.
Sent from my GT-I9500 using XDA Premium 4 mobile app
Click to expand...
Click to collapse
I didn't say it would be an easy/simple port, I just asked if it was possible. I didn't look at your github (and I have almost no experience with the P6800 kernel)... You know your sources better than anyone else, so I assumed you would understand better than I do what (and where) would need to be changed. I'm not diminishing your work or your effort in any way, shape or form; I respect the developers who stuck with this amazing device for so long, and who continue to make it usable way past what Samsung intended.
Our battery has a total capacity of 5100 mAh. From http://batteryuniversity.com/learn/article/charging_lithium_ion_batteries:
The charge rate of a typical consumer Li-ion battery is between 0.5 and 1C
Click to expand...
Click to collapse
That gives us a "safe" maximum charging rate of between 2550 mA and 5100 mA. 0.7C is generally agreed as a good rate for this first stage charge for Li-Po batteries, which means 3570 mA; the regulators on the tablet will reduce the rate when needed. Generally, charging Li-ion/Li-po batteries at such a low rate (~0.3C) is detrimental to the battery max charge, and a major screwup by Samsung (and explains why my P6800's battery doesn't last as long now as it did on its first month); that is why I asked. But that was just a question. If you won't do it, I respect your position.
About charging from the power bank, I don't get your point. As I said, when I plug my P6800 on my power bank, I don't get the red X; I see the regular charging animation, and the device charges as fast as it does on the stock wall charger (which is just an adapter that presents an USB connection where you plug the tablet's cable). I understand that when the tablet recognizes it's on a standard USB port, it will use the lower charge rate. But "power-only" USB ports, such as the one on the Samsung wall charger and the one on some power banks, will be recognized as power-only connections (or as the same as the Samsung wall charger), and will charge the device as fast as the kernel allows.
My power bank (this model to be precise) is detected as an AC charger on both my I9300 and my P6800, and would be a good option for the OP.
Don't get my point? Please 're-read the last paragraph in my previous post carefully.... I wasn't disputing your claim, but explaining about the battery charge icon.
Obviously your power bank has some "trickery" to fool the device as AC charge. Probably a resistor combo across the lines inside the source. This being the case, makes a good option for OP (or anyone else) on stock.
UpInTheAir said:
Don't get my point? Please 're-read the last paragraph in my previous post carefully.... I wasn't disputing your claim, but explaining about the battery charge icon.
Obviously your power bank has some "trickery" to fool the device as AC charge. Probably a resistor combo across the lines inside the source. This being the case, makes a good option for OP (or anyone else) on stock.
Click to expand...
Click to collapse
yeah, one of my power banks would trick my tab on one of its ports. some resistor thing.
Its due to having resistors put across the data lines.
This is done to trigger the tablet into AC charging mode.
the wall charger has this done to it.
some batterys have a samsung charger cable or a micro usb adapter.
This adapter has resisters inside it.
i have one of these and charges on ac charging.
if i get another cable such as data or car charger etc..
it wont trigger charge even on 2 amps.
good news is a adapter can be made to go from usb to usb...look it up it has 2 resisters in it and also shorts the data lines to each other.
MRBR7 said:
Its due to having resistors put across the data lines.
This is done to trigger the tablet into AC charging mode.
the wall charger has this done to it.
some batterys have a samsung charger cable or a micro usb adapter.
This adapter has resisters inside it.
i have one of these and charges on ac charging.
if i get another cable such as data or car charger etc..
it wont trigger charge even on 2 amps.
good news is a adapter can be made to go from usb to usb...look it up it has 2 resisters in it and also shorts the data lines to each other.
Click to expand...
Click to collapse
Just as I presumed. Thanks
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I have a charger that has two usb ports in it. One says ipad and the other galaxy tab.
If I use the ipad one and use it on the 7.7 it thinks an usb device is connected, shows the charging icon and also the red x, but doesn't charge. I think it just has to do with the voltage it receives on certain pins, but what is the meaning of the cross?
Menster said:
I have a charger that has two usb ports in it. One says ipad and the other galaxy tab.
If I use the ipad one and use it on the 7.7 it thinks an usb device is connected, shows the charging icon and also the red x, but doesn't charge. I think it just has to do with the voltage it receives on certain pins, but what is the meaning of the cross?
Click to expand...
Click to collapse
As it will accept a max of 450mA on detected "USB charge", it still should charge, but very slowly.
If you leave the screen off for a while, you should see the battery % indicator increase. If you use the tab while on detected USB charge, the device may consume more current than 450mA, hence the battery % indicator may not increase but instead decrease.
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