Database Users

[Q] Reverting from unofficial 2.2 to stock 2.1 without losing apps and settings

I made the mistake of putting 2.2 on my mother's Epic, and she doesn't like the increased battery drain. I'd like to restore her phone back to 2.1, yet she has games on her phone she doesn't want to lose progress on. I've already done a restore to 2.1 from 2.2 on my phone but I did a complete wipe. Would rooting and backing up apps with titanium backup work?

Increased battery drain? I normally get a full day's use out of my battery on DK28. Earlier this week I was above 60 hours of uptime on a single charge.
There is a way to keep apps and settings, but it may cause issues when switching between 2.2 and 2.1. Use clockworkmod to back up the phone. Flash/Odin the 2.1 stuff. Boot back into clockworkmod and Restore->advanced restore->restore /data. You may have problems with force closes after this, but results vary and you may have no troubles at all.

Battery should be MUCH better on 2.2.

On both her phone and mine the drain on battery was pretty noticeable. She's not a big phone technical person but even she noticed it after I updated it for her.

Get mybackuppro and make a backup of just the apps she needs the data on. Then restore that back on 2.1. It will give you the option to backup the apk or the apk and data choose both.
Sent from my SPH-D700 using Tapatalk

If you go from 2.1 to 2.2 I would highly recommend a wipe...battery life should be better.

Just wanted to further state that battery for me has been much better on 2.2
After a 8 hour day at work (phone off the charger for ~9 hours) I drop anywhere from 25-32% on average... can't really complain with that

I had substantially worse bttery life on 2.2. It seems to be a common complaint amongst many, while not an issue for others.
I'm suspecting that changes in battery life may be dependent on how you use are using the phone. I am pretty heavy user streaming radio, bluetooth, web, games and a 1 hour difference is pretty noticiable. Now if I was getting 60 hours like that other guy, I doubt I would notice an houror even two difference.
Sent from my SPH-D700 using XDA App

iil said:
I had substantially worse bttery life on 2.2. It seems to be a common complaint amongst many, while not an issue for others.
I'm suspecting that changes in battery life may be dependent on how you use are using the phone. I am pretty heavy user streaming radio, bluetooth, web, games and a 1 hour difference is pretty noticiable. Now if I was getting 60 hours like that other guy, I doubt I would notice an houror even two difference.
Sent from my SPH-D700 using XDA App
Click to expand...
Click to collapse
While some may debate on how necessary it is, have you "recalibrated" your battery? I put recalibrate is quotes because your not actually doing anything to your battery, but erasing the battery stats on the phone, thus allowing your phone to accurately read the percentage of battery left. If no "calibration" is done, it is possible that your phone may say 10% left, when you actually have closer to 30 or so (just an example).
To "calibrate" your battery, charge it up completely, boot into CWM, go to Advanced->Wipe battery stats, boot up the phone and use it until it turns itself off (dont plug it in during this time). This way the phone can accurately determine how much power the battery has left.

Koadic said:
While some may debate on how necessary it is, have you "recalibrated" your battery? I put recalibrate is quotes because your not actually doing anything to your battery, but erasing the battery stats on the phone, thus allowing your phone to accurately read the percentage of battery left. If no "calibration" is done, it is possible that your phone may say 10% left, when you actually have closer to 30 or so (just an example).
To "calibrate" your battery, charge it up completely, boot into CWM, go to Advanced->Wipe battery stats, boot up the phone and use it until it turns itself off (dont plug it in during this time). This way the phone can accurately determine how much power the battery has left.
Click to expand...
Click to collapse
I'm in the group with the poor battery life after DK28, I will definitely give this a shot tomorrow morning after I charge up tonight, however, my issue seems to be with the display under battery use it shows to use most of my battery even with very little use of display, even with long phone calls with the display off it about equals the battery use of the phone call, hoping this will fix it for me

I went 10+ hours with 4-1/2 hours of screen on time. heavy internet, moderate text, 2 20+ minute phone calls. This was with dk28
Sent from my SPH-D700 using Tapatalk

jojo08 said:
I'm in the group with the poor battery life after DK28, I will definitely give this a shot tomorrow morning after I charge up tonight, however, my issue seems to be with the display under battery use it shows to use most of my battery even with very little use of display, even with long phone calls with the display off it about equals the battery use of the phone call, hoping this will fix it for me
Click to expand...
Click to collapse
Before you wipe your battery stats, charge to 100%. Unplug the phone, turn it off, plug back in and charge again until it says full. Then boot into recovery and wipe your battery stats.
For those that use their phone a lot, don't charge while you are playing on your phone. It makes your battery hotter and can decrease capacity. Don't keep trying to turn your phone back on after it is dead, either. That can damage capacity and possibly make the battery unchargeable.

Cyanogenmod 7 on Nexus One - super awesome battery life, stable wifi!!

I can't post in the Development area yet, so I'm posting it here.
2nd day using CyanogenMod 7, and here's my feedback:
- Very stable
- It seems to have solved my Nexus One touchscreen issue. I've tried CM6 and Enomther before, and this was never resolved before.
- The Wifi is stable with no drop (is it because of the new radio in CM7 ??)
- Super duper battery life!! Even way better than Enomther. By noon, usually I'm at 81-85% with very light activities (browsing, reading emails, etc) and nothing running on the background except Corporate Email and a couple GMail accounts sync. Today it's still 89% and this is fabulous. Note that I've set the Wifi to "Never Sleep". The battery life is SIMPLY AMAZING!
- I can't notice speed differences with ENomther.
- I couldn't care less for the animation or eye candies, but the touchscreen keyboard fix, wifi stability, and long battery life are very important. FYI I wiped everything (data, Dalvik Cache, battery stats, rotation, etc)
THANK YOU, CYANOGEN!

you should judge your battery on a whole days worth of use. The ~5% difference in a couple hours could easily be made by one app or game being run. I'm getting ~36 hours out of my MIUI setup. Though I block and limit many background syncs.
No doubt CM7 is great, huge step from what many android phones are stuck with out there. ps, CM7 doesn't include a radio.

foreverwinter said:
I can't post in the Development area yet, so I'm posting it here.
2nd day using CyanogenMod 7, and here's my feedback:
- Very stable
- It seems to have solved my Nexus One touchscreen issue. I've tried CM6 and Enomther before, and this was never resolved before.
!
Click to expand...
Click to collapse
What touchscreen issue?
And it still has the mic-not-working in a call problem, so it's useless if I can't use my phone as a phone.

My N1 has a touchscreen issue since day 1 ... seems to have been fixed in this release.
http://www.lmgtfy.com/?q=nexus+one+touchscreen+problem
Mic is definitely working here. Talked on the phone twice yesterday.
Battery life is definitely awesomeeeeeeee. I have 4 accounts in my N1 (2 corporates, 2 GMail).
Kimd41 said:
What touchscreen issue?
And it still has the mic-not-working in a call problem, so it's useless if I can't use my phone as a phone.
Click to expand...
Click to collapse

My gps loses its signal right after it gets a lock. I'm using CoPilot. Anybody having gps issues?
Sent from my Nexus One using XDA App

Yeah same experience here. What current draw are you seeubf during idle use? I'm seeing 4-5 mA which is great.

I don't think daily usage is a good way to determine battery life.
Best way is to see how much % drops overnight.
CM6 I was seeing 3-7% overnight, CM7RC4 I am seeing 7-20%.
Haven't had CM7 final long enought to check but first night I lost around 10%.
This is with all data off, 2G only and no services running apart from the basics.

behelit said:
This is with all data off, 2G only and no services running apart from the basics.
Click to expand...
Click to collapse
Yeah, that's totally the best way to determine usable battery life.
/sarcasm

LOL .. 2G and no services running?
I have GPS, Wifi, 3G all ON. 4 sync accounts (2 MS Exchange, 2 GMail). I have no Facebook sync, however. 3rd day ... still really amazed with the battery life. FWIW, I set the brightness to low (I don't need it that bright anyway) as usual. Same way I usually set it with my 2.2 Enomther ROM and CM6 and stock ROM. Battery life on CM7 is simply AMAAAAAAAAZZZZINGGG or maybe I'm just lucky
GPS locks in seconds, but I haven't done an extensive test with it yet. I'm going to use it (I have both CoPilot and Sygic Aura).
The only weird thing is that ADW Launcher closed and I had to reboot the phone once yesterday to bring it back on ???
Other than that, I'm super duper happy with CM7, especially the battery life
behelit said:
This is with all data off, 2G only and no services running apart from the basics.
Click to expand...
Click to collapse

Kimd41 said:
And it still has the mic-not-working in a call problem, so it's useless if I can't use my phone as a phone.
Click to expand...
Click to collapse
Search for and install "dewonkificator." It has fixed all of my call related problems, along with several others.

I also think that Gingerbread should be given much of credit for the Wifi fixes.

Im finding my battery getting eaten up noticeably faster from CM6 but its worth it for all the fixes/features.

best battery life ever, I pick my phone up ... IT'S COLD!

I've been using Kang-o-Rama 1.1, which is based on CM 6. I tried several different kernels and settled on the wildmonk kernel (2.6.35.10 though I'm sure there are newer versions now), because it gave me a similar excellent battery life as others have described here. I had been using various ROMs before that (those that are close to stock, with a few nice features added) and always had pretty bad battery life.
CM 7 therefore isn't necessary if you want stability (e.g. a phone that always works as a phone, no random crashes etc.) and excellent battery life. I'm cautious about CM 7 (and the soon-to-be-released Kang-o-Rama based on CM7) until the "wonkiness" issue is fully addressed - I don't consider having to install the dewonkifier program fully addressing the issue!
I like to have the latest and greatest, but having a potentially unstable phone is really annoying! Just have to be patient. Regardless, Cyanogen and everyone working on custom ROMs must be applauded for their efforts, don't know what I'd do without them
I have to say I'm a bit miffed about not being able to post in the development forum, which is the main reason I read xda...

Has anyone noticed a difference in battery performance between the first discharge and subsequent discharge cycles on the later cm7 builds? I've noticed that my phone will drains faster the over longer uptimes. The first discharge cycle after a boot discharges at an average rate of 3% to 5% per hour, averaged over a full day. Use over a full day for me is fairly light with some texting, one or two brief calls, and maybe some web and facebook. The battery is usually over 60% in after 8 or 10 hours on battery on that first discharge. After a full recharge, the drain rate on the next discharge seems higher. I've observed that similar use through a second discharge cycle is typically 5% per hour or more. I sometimes struggle to get more than 10 hours use out of the phone on that second charge.
I have noticed the Status Bar app seems to account for an abnormally large amount of battery use. Where's My Droid Power app reports the Status Bar consistently as the top power consumer on the device. Status Bar's power consumption in that first discharge cycle is usually reported around 10%, but jumps to 30% on subsequent discharge cycles. Other known power hogs consistently consume 5% to 6% according to the app. I don't know how the power monitoring app derives its data, but nothing shows up as strange in the Spare Parts battery history. I'm beginning to wonder whether the "where's my droid power" app's statistics gathering might be being baised somehow. It leads me to question my data.
So, does anyone have similar observations on frst discharge versus second discharge rates? Does anyone know what the Status Bar app actually does, and whether it might actually be contributing to higer battery drain? Finally, is there a better power monitoring app i should be looking at to track down rogue apps?

Solidgrue said:
Has anyone noticed a difference in battery performance between the first discharge and subsequent discharge cycles on the later cm7 builds? I've noticed that my phone will drains faster the over longer uptimes. The first discharge cycle after a boot discharges at an average rate of 3% to 5% per hour, averaged over a full day. Use over a full day for me is fairly light with some texting, one or two brief calls, and maybe some web and facebook. The battery is usually over 60% in after 8 or 10 hours on battery on that first discharge. After a full recharge, the drain rate on the next discharge seems higher. I've observed that similar use through a second discharge cycle is typically 5% per hour or more. I sometimes struggle to get more than 10 hours use out of the phone on that second charge.
I have noticed the Status Bar app seems to account for an abnormally large amount of battery use. Where's My Droid Power app reports the Status Bar consistently as the top power consumer on the device. Status Bar's power consumption in that first discharge cycle is usually reported around 10%, but jumps to 30% on subsequent discharge cycles. Other known power hogs consistently consume 5% to 6% according to the app. I don't know how the power monitoring app derives its data, but nothing shows up as strange in the Spare Parts battery history. I'm beginning to wonder whether the "where's my droid power" app's statistics gathering might be being baised somehow. It leads me to question my data.
So, does anyone have similar observations on frst discharge versus second discharge rates? Does anyone know what the Status Bar app actually does, and whether it might actually be contributing to higer battery drain? Finally, is there a better power monitoring app i should be looking at to track down rogue apps?
Click to expand...
Click to collapse
There is a bug in the status bar process. If you have battery percent enabled in the status bar, when you plug in the charger, the status bar process uses 10-30% CPU for the next hour during charging. If you disable batt percent and charge this does not happen.
I looked at the source code and was gonna try a fix soon.
On previous cyan 6, charging temp disabled the percent. Also this slows things down and home screen scrolling gets super choppy.

RogerPodacter said:
There is a bug in the status bar process. If you have battery percent enabled in the status bar, when you plug in the charger, the status bar process uses 10-30% CPU for the next hour during charging. If you disable batt percent and charge this does not happen.
Click to expand...
Click to collapse
I do have battery percentage enabled, so that could explain that. Thanks for the feedback! I could convince myself I tried disabling battery percentage before, but who pays attention to the little things when you're having so much fun?
Oh, and an update on the battery discharge thing. I left my Wifi on full time after my last full charge, and i'm about to roll over 2 days runtime with about 10% left. I haven't seen performance like that since i enabled a Corporate Email account.

Yeah I'm getting superb standby battery life on cyan #39 right now. Idle current draw overnight for 8 hours, with wifi on, is seeing 7 mA current drain steadily.

CyanogenMod 7 not working!
I just upgraded to the new CyanogenMod 7 on my Nexus 1 and unfortunately it is not loading. It gets to the CyanogenMod screen, with the Android guy on the stake board and the arrow going around him, but it just wont go passed that screen. It has never gone passed this screen.
What i have tried:
Taking out the battery and restarting it
letting it run for 30 minutes
If anyone one can help me I would greatly appreciate it
Regards,

What kernel are you guys using on CM7 for such awesome battery life? I've tried stock for one week, then redstar with minimal improvement.

Display power usage

Hi,
I recently flashed my G2 to the leaked T-Mobile gingerbread release: so it's not rooted or anything like that. I'm not using it any differently to how I was before.
The upgrade went very smoothly. However, the battery seems to be draining a lot more quickly than prior to the upgrade, and Android's battery usage app points a very damning finger at the display: currently it's showing 67% usage, and pretty consistently shows a high usage most of the day.
Before, I could consistently run the phone for the whole day and charge overnight, but now I'm finding that I have to charge it a bit during the day too in order for it to make it to the night.
I'm pretty sure that I'm not using it any more than usual, and I pretty much always have brightness set to 20%.
So my question is, what could be causing this? Could something be using the screen when it's not supposed to be even though it's not showing anything? Could it be a battery calibration issue? Maybe the power usage app in gingerbread calculates what it attributes power consumption to differently to froyo (though that wouldn't explain the overall reduction in life). What, if anything, could I do to try and track this down further?
Any suggestions would be appreciated!

Some things I should add.
I really haven't changed my behaviour regarding how I use things like wifi, bluetooth and gps. In fact, so far I actually have one fewer gmail account set up on it that before the upgrade, so sync should be doing less work. The apps I'm using are all about the same.
When I said I could use it for the day, I mean it would often end the day with more than 50% battery left. On some days I'd get it down really low, but that would be due to obvious extra usage, which isn't the case here. Occasionally I'd let it die completely. I always charge it fully overnight.
Finally, here are the other top items in my power consumption list at the moment:
Display: 67%
Maps: 8%
Cell standby: 7%
Phone idle: 5%
I seem to remember that before the upgrade, Cell standby and Phone idle were usually the top users of power.

no problem
Sorry, but I don't see any problem. Maybe its just placebo. This is the same on every android based phone. I Had HD2 and had 2 NAND androids till now and the battery stats were showing also display use 60% and then after new NAND version - gingerbread they were up to 80%+ but the battery was better than ever before.
Let me explain it to you. The display should consume most of the battery if you have 3.7 inch display and more. Maybe some navigation and 3G is the biggest sucker like the display but with normal use the Display. And if your display consumes lets say 75% of battery over when you are at 1% battery then it means it sucked 3/4 of your battery and just 25% other things did like phone idle and cell.
If it was before and your display consumed like 40% or less that meant that the other things like cell standby, phone idle consumed more power so it wasnt battery efficient. So its more battery efficient. Maybe you just have much more awake time than you did before. The awake time - sucks the hell of your phone(some apps warn you taht your phone wont turn to the sleep, which means your processor is still working hard which means your battery will deplete completely in a short time)
I experienced this also that my phone lasted only 6 hours or so and before it could wen to all day . Then I deleted some apps which were causing it and my battery was perfect.
and last advice. try to charge your phone via USB, I dont really know why it is caused but it will last longer , but on the other hand you will have to charge it longer. But if you go somewhere where the extra juice is needed then its nice.
With these steps my HD2 with old battery (about 1000mah left on 100%) went through 2 days of medium USE and about 5 days of just receiving calls and messages) so I dont know anyone else who could say that !
¨
hope I helped you. GL a HF

If you can stand it, turn the brightness as low as you can handle . EDIT, you're already doing that....hmm
Not sure why gingerbread is giving you problems, personally I find it slightly better with battery than froyo.
Sent from my T-mobile G2

Hmmm... placebo. By that, I presume you mean that since Display is ranking higher in the list now, that's making me think more battery is being used before. I suppose it's possible, but really it's more to do with how often I've been reaching that "I should charge" point, which for me is a function of battery level and time. If I get to 50% before lunch time, I think "I should charge". But getting to 15% just before bed I don't. What I've noticed is that since the upgrade I've reached the "I should charge" point every day.
I'm just very surprised by how the proportions in the battery usage list have changed, while a the same time the phone's battery usage seems to have increased, despite the fact that Gingerbread's battery usage is supposed to be improved.
One other thing that came to mind: perhaps Gingerbread's battery usage is just more accurate than Froyo's? It always seemed to me that the battery level used to work a lot like a car's fuel gauge: it would stick at 100% for a long time and then would drain. It was as though "full" as a concept understood by Android was a range rather than a limit, and so as a result the phone appears to drain more quickly, but it's actually just showing a more accurate battery level over time. Just a theory.
So last night I allowed the phone to completely die. This morning I switched on and immediately checked battery usage: display showing 99%, which is exactly what I'd expect. So I'll see how it goes now that Gingerbread has experienced battery exhaustion.

Personally, if I was upgrading from Froyo to Gingerbread, I'd prefer to start from scratch rather than doing an "in-place upgrade". I'd worry that maybe there are some leftover settings or files from Froyo that could cause unintended consequences. Consider backing up as much data/apps as you can (it's more difficult if you don't have root), charging the battery up to 100%, doing a factory reset, and then restoring and reinstalling everything back. Doing this will also reset Android's battery stats file, so you may find your battery levels maybe inaccurate while it's relearning the right levels for a few days.
Alternatively, if you don't fancy a factory reset just yet, you could try monitoring your power use with a widget like CurrentWidget which looks that the current draw rather than percentages. Also consider installing Watchdog Lite which might be able to help you identify if there are any processes using excessive CPU cycles.
EDIT: Just realised that if you flashed a leaked version, the install would probably have wiped everything anyway, so you can probably disregard the first paragraph.

Like the others have said, I think the screen usage being higher in 2.3 has more to do with the reduced usage of other apps and not the screen using more battery than in 2.2.
Think about it, most of the high battery usage items (web browsing, etc) also keep the screen on at the same time.

Yes, that's probably mostly because other things are using less power. I also suspect that maybe Gingerbread's battery usage app is calculating display usage differently: I just checked it on someone else's G2 (still running Froyo) and Display was way down the list. It dominates mine, even though I haven't used it that much today.
Today's power consumption has been a lot better. It's down to 39% now after 12.5 hours on battery, with 59% of that being attributed to Display. So that's not bad at all really.
Thanks for the tips on the monitoring apps. I'm already using System Panel (which only seems to care about apps and not hardware so much), but it's always worth checking out alternatives.

Couldn't it be due to you being in areas with bad connection?
I noticed that my G2 is down tot 30% after a few hours at school in bad reception+bad wifi areas. When I'm home the whole day my G2 is still at 60% at 10pm.
I have 2 exchange mail accounts set up to push and one gmail account...
Sent from my HTC Vision using XDA App

[Q] Desire Z : Really Inconsistent Speeds + Battery Issues

Friend has a new Desire Z (bell, unlocked). Using it on AT&T network.
When at a house, and we use WiFI (30Mbps DL, 25Mbps UL), the speeds are VERY inconsistent. With my iPhone 4 using speedtest.net, it shows up as 20/15 each time. (WiFi is a little slower than the modem).
With the Desire Z, we get 15/10 (which is fine/acceptable). Then 3 minutes later we do it, we get 5/2. Without even moving the phone or touching the modem connection (not downloading anything on the computer), the connection just gets slower. Then it might be fast or slow, basically it's a toss-up.
The first time we noticed the issue is because when we are outside, we get HSPA speeds of 2.5/1.0, then randomly decreases to 0.1/0.05. HUGE difference. And VERY inconsistent. He is using a microSIM from iPhone 4, with an adapter, so we figured maybe the SIM card is getting loose at certain points? However, the WiFi is also inconsistent in addition to the HSPA, so it's probably not that.
What should I do? Is this the situation where I have to flash a new radio or something? (Please suggest others if I am wrong).
Thanks!
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Also, his battery is kinda weak. The battery health is apparently clean/healthy. He came from an iPhone 4, where he would have 3G, WiFi, and GPS on at night but not actually using them. Wake up, and 3% battery loss, maybe 5. WITHOUT using them, just having them on.
Now, with the Desire Z, we have the WiFi + 3G on, but NOT the GPS. He is losing 20%-25% in 8 hours without even using the phone.
Information about battery shows a high Cell standby (25%) and Phone idle (25%) percentage. When going into Spare Parts > Partial Wake usage, we didn't find anything really fishy. BUT we had rebooted so perhaps some info may have been lossed. Should he just go to sleep tonight and report the Partial Wake Usage statistics again?
We have a feeling it may be some apps refreshing at night.. But he clears all the apps with Advanced Task Manager except for like Facebook (2 hour interval refresh), GMail, and Google Voice.
I highly doubt a 20% battery decrease overnight is normal.. My mom's Atrix only loses about 5% overnight, with the same parameters I gave before.
I thought it may be a bad battery, BUT the phone idle + cell standby are abnormally high.
Thanks!

Why is this in General as well as Q&A?

Put this in Q&A, didn't get any answers. Went to General, saw that more people posted there, even for Q&A's. Have an actual problem that research didn't help much with, so made a thread. If necessary, I would be glad to remove the thread on Q&A.
By the way, thanks for the answer .

Would you be able to post your software specs? Radio version, rom version, android version? My Bell DZ only loses about 3% per night if I don't plug it in to charge. I, like you, have wifi, gps and hspa enabled with no huge I'll effect.
The stock battery is usually alittle weak. Being a 1350mA, it doesn't have the capacity either, but that is why it is user replaceable. I picked up the mugen 1800mA battery that gives the phone the stamina to last a full day of full use or 2-3 days of light use. I forget how much I spent on it but it was definitely an upgrade.
As for the signal issues, we would need to know what you are running. The latest .30 radio is recommended for AT&T if I remember correctly. Also, the type of rom (stock or custom) might give us abit more insight.
Sent from my HTC Desire Z using XDA App

I lost about 10% overnight today I believe, possibly 15 (don't remember exactly what I left off at).
Not sure on all the stats because I don't know how to check them but
Android Version 2.3.4
Cyanogenmod 7.1.0-RC-Vision (seller did it for me)
What is the radio version? I think that is baseband not kernel? If so its 12.52.60.25U_26.08.04.30_M3
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If anyone knows about the sporadic data, that'd be helpful. It does seem that if I go into airplane mode a few times it fixes itself, but I doubt everyone does that to ensure fast HSPA speeds
Sent from my HTC Desire Z using XDA Premium App

I've never used CyanogenMod Custom ROM's before, so I can't speak from that experience. I can, however, tell you that while running RMK (and team's) Custom ROM's (Virtuous, G-Lite, Unity) and now MIUI, battery life has been excellent, even with the stock battery. The current build of MIUI lasted for about 15hrs on a day of full use, RMK's ROMs would last about 12-15hrs of moderate to full use on the stock battery. Alot of the custom roms have different power management settings and tweaks, if you're comfortable with flashing, I would recommend another ROM and see if that helps with either of your problems.
If you like the Vanilla/AOSP look of android, try RMK's G-Lite ROM. It is very lightweight, fast and stable. I remember having one issue with it, but it was a very small issue and didn't stop me from using it for a few months.
I am currently on MIUI English 1.7.1 and with moderate use I am sitting at 50% charge spent over 2 days. Moderate for me is about 300 texts with about 10 phone calls and a total of about 4hrs of web browsing.
I can link you to those roms if you need, but they're all located in the Dev section. Your radio seems like it's on the right version, so perhaps it's not the issue. Try running another rom for a week and see if that helps to any degree.

I re-calibrated the battery, let it die, charged it up, let it die, charged it up. I followed the instructions to the letter and all that.
It was at 100% when I went to sleep. Woke up 8 hours later, 74%.
Settings > Battery shows nothing high 40% for cell standby and phone idle. Everything else (Facebook, etc.) REALLY low.
Then I went to Spare Parts > Battery Usage, Partial wake usage, everything incredibly low as well..
I will try Watchdog, but could it just be a bad battery? Or maybe should I try a different ROM?
Thanks!

JayXL14 said:
I re-calibrated the battery, let it die, charged it up, let it die, charged it up. I followed the instructions to the letter and all that.
Click to expand...
Click to collapse
NO! This is poor recommendation, and people need to stop perpetuating it. People keep recommending this, but its NOT a good idea to let the battery drain until it dies, just to calibrate the battery meter. While the protection circuit on the battery will USUALLY prevent over discharge, it is not 100% failsafe. There is a slight possibility that over-discharge of the battery will happen, and then the battery is no good, and will need to be replaced. Unless you have a special battery meter with a "boost" function (which most people do not have access to). See the following table on Battery University, where it says for Li ion batteries: Discharge: Prevent full cycles
http://batteryuniversity.com/learn/article/do_and_dont_battery_table
Best practice is to charge to 100%, drain to about 20%, repeat a couple times. No need to go below 20%. The battery meter is not very accurate to begin with, so there is no value added going to 0% versus 20%, but you risk killing the battery.
Plus people keep abusing the terminology. You are just calibrating the battery meter, not "calibrating the battery". When people say this, I think its just a holdover from the old days of NiCad batteries, where you had to condition/discharge the batteries periodically to prevent memory effects (Li ion batteries do not suffer from memory effects, and require no period cycling).

Can't really speak to the Atrix or the iPhone. But the battery drain on the DZ described by the OP is right in line with what I've seen. I also have an unlocked Bell DZ on AT&T, and battery drain of 2-4% (on various ROMs and couple different radios) when the phone is completely idle, screen off is totally normal. Best I've seen on my DZ is with the Virtuous Unity ROM and the .30 Gingerbread radio, where I've seen somewhere around 1-2% drain per hour when idle.
One possibility, is that the different phones are not reporting % battery the same way. As I've mentioned above, the battery voltage meters on phones is not very accurate, maybe in the range of 5-10% accuracy (although, even with this, the drain on the DZ versus the ATrix and iPhone still sounds inconsistent). But what is more important is how many hours of usage you get before needing to charge.

Thanks for the info.. Ill try charging that way.
And I honestly think the battery is just reading it wrong. It honestly feels like it dies faster idle than not, go figure. Yesterday, at like 10% battery, I wanted to kill it off, and played a game for like 10 minutes straight, still 10...
Then I tried leaving the flashlight on for 10 minutes on and it maybe lost 1
How is that battery I recommended from dealextreme though?
Sent from my HTC Desire Z using XDA Premium App

It's interesting to see all the troubles that people are getting on the DZ...
I've had my DZ for about 6months and never seen any of the reported problems.
My 1350mha will last me on a frequent usage near 24hrs and if I'm using it lightly like when i'm busy at work... almost 2days worth.
Mind you I'm running Cyanogen MOD7. No GPS. Wifi is on and I use JuiceDefender.
Cheers mates.

Last night, I charged my phone to a complete charge before going to bed to see what kind of drain I would see overnight. After 9.5 hours, my battery had only lost 2% sitting idle. That is with 3G on, but no Wifi or Bluetooth enabled.
The phone idle accounted for 47%, cell standby 48% and Android system 4%
While it seems remarkable, I'm still not convinced that its not my phone incorrectly reporting the battery level. On a typical day when I pull my phone off the charger, the first 10% is very slow to drain. Today, I have sent a few text messages and played maybe 3 minutes of word feud. That has drained 6% of my battery.
We will see where I'm at later in the day. I suspect that the actual level is lower than the 94% it is reporting. Typically, I get between 12-16 hours of usage, depending on how much I play with my phone.

Well I am at nearly 23 hours on this charge. Have used the phone rather lightly during the day. It sat idle for about 9 of those hours while I slept last night.
Conclusion: Idle drain is very minimal on my device and looks as though the percentage was being reported rather accurately. I'd say if you're having a lot of drain while sitting idle, do some digging and find what it is.
More info:
Facebook: update 1 hour
Gmail Sync: 1 hour
Fancy Widget update: 1 hour
Brilliant Quotes widget: update 1 hour
Light Bluetooth usage (about 15 minutes)
Wifi on all day (not overnight so about 14 hours total)
Screen brightness set at about 50%
Average signal strength: -100dbm

4.2.2 stock battery life worse?

I'm noticing that battery life is worse in 4.2.2 - I was on cm10.1 nightlies w. Cm10.1 kernel and was getting about 10 hours screen-on time before I needed to charge, but I'm getting 7 hours at best on 4.2.2 stock (rooted, bootlader locked).
I have the usual culprits turned off - Google now, location services, currents background updates etc. So I hoped I would at least get the same.
Anyone else?

eager27 said:
I'm noticing that battery life is worse in 4.2.2 - I was on cm10.1 nightlies w. Cm10.1 kernel and was getting about 10 hours screen-on time before I needed to charge, but I'm getting 7 hours at best on 4.2.2 stock (rooted, bootlader locked).
I have the usual culprits turned off - Google now, location services, currents background updates etc. So I hoped I would at least get the same.
Anyone else?
Click to expand...
Click to collapse
Put the latest cm10.1 build on. They merged in 4.2.2.

eager27 said:
I'm noticing that battery life is worse in 4.2.2 - I was on cm10.1 nightlies w. Cm10.1 kernel and was getting about 10 hours screen-on time before I needed to charge, but I'm getting 7 hours at best on 4.2.2 stock (rooted, bootlader locked).
I have the usual culprits turned off - Google now, location services, currents background updates etc. So I hoped I would at least get the same.
Anyone else?
Click to expand...
Click to collapse
I have never gotten more than 8 hours of battery life with 4.2.1, but so far on 4.2.2 I'm down to 73 with 3:30 screen time, so I guess it got better for me
Sent from my Amaze 4G using xda app-developers app

blackhand1001 said:
Put the latest cm10.1 build on. They merged in 4.2.2.
Click to expand...
Click to collapse
Yes! I just read that. I am just about to do it now.

I can't comment on battery life, but did notice something a little alarming with regard to battery drain. Was on the couch for an hour talking to someone using viber, just plain text. No video or audio. Tablet was plugged into the wall, and after about an hour i noticed that the battery had gone from 100% to 98%. Should not be possible for a simple messaging app to cause the battery to drain faster than it can charge. screen was on auto brightness as well.

hughlle said:
I can't comment on battery life, but did notice something a little alarming with regard to battery drain. Was on the couch for an hour talking to someone using viber, just plain text. No video or audio. Tablet was plugged into the wall, and after about an hour i noticed that the battery had gone from 100% to 98%. Should not be possible for a simple messaging app to cause the battery to drain faster than it can charge. screen was on auto brightness as well.
Click to expand...
Click to collapse
Did you look at your battery information to see what was using the most energy? Display is always far and away the highest for me, and if it was on Auto Brightness, depending on the lighting around you, it could have been running at full brightness...which would be a pretty massive drain on battery.

hughlle said:
Tablet was plugged into the wall, and after about an hour i noticed that the battery had gone from 100% to 98%. Should not be possible for a simple messaging app to cause the battery to drain faster than it can charge
Click to expand...
Click to collapse
Once the device reaches a full charge it cuts off the power draw to avoid damaging the battery. It's normal for it to hover between 97% and 100% while still plugged in.

I barely get 6 hours of use now.

Jackietreehorn said:
Did you look at your battery information to see what was using the most energy? Display is always far and away the highest for me, and if it was on Auto Brightness, depending on the lighting around you, it could have been running at full brightness...which would be a pretty massive drain on battery.
Click to expand...
Click to collapse
I did not look at battery usage, but the screen was generally dimmed, where as normally i have it manually set to full brightness, and nothing was running in the background that would not normally be running, that is to say nothing other than android stuff, it's basically a tablet for internet, email and skype/viber while i watch films etc on my computer
Fromako said:
Once the device reaches a full charge it cuts off the power draw to avoid damaging the battery. It's normal for it to hover between 97% and 100% while still plugged in.
Click to expand...
Click to collapse
Indeed, but this has never happened before and i typically run the device with screen on maximum brightness. on 4.2.1 it would always show 100% when plugged in, i never once saw it drop to 99% or below.
So without further analysis of the issue, it could either be that something is sucking more power, which would seem odd, or that the update has brought about changes to the way the device charges, or changes to the way the device displays the battery level.

Damn guys, I don't know what I'm doing wrong, but I'm jumping around in happiness when I manage to get over 6 hours of screen time lol.

I've been on battery for the past 12+ hours with about 6 hours 15 minutes screen time and still have 36% battery left. Battery seems at least as good as on 4.2.1.
... beamed from my Nexus 10 to your planet

bee55 said:
Damn guys, I don't know what I'm doing wrong, but I'm jumping around in happiness when I manage to get over 6 hours of screen time lol.
Click to expand...
Click to collapse
if you are rooted change your processor speed to 1.5gHz, it really helped me get better battery life
so far at 6 hours of youtube with 50% left to go

filthygoat223996 said:
if you are rooted change your processor speed to 1.5gHz, it really helped me get better battery life
so far at 6 hours of youtube with 50% left to go
Click to expand...
Click to collapse
Thanks, I've done this now, and get about 5~6 hours of screen time now with around 50% left.

My battery life has gotten considerably better after updating to 4.2.2. The biggest improvement is how little the battery life drains on standby...it's nearly nonexistent.
Sent from my Nexus 10 using Tapatalk HD

Standby has always been great for me. With stock rooted 4.2.2 I'm getting great battery life. Loses maybe 2% after 8-10 hours idle. In constant use I'm averaging 11 hours on screen. I have everything on and synced but as I'm indoors I stick to 30% brightness. Also, I'm mostly just browsing. With games the life would be less for sure. Totally satisfied with the battery life of this tablet. If yours is getting truly bad battery life I suggest you try searching for rogue apps. After that, try a complete reflash of the stock image which deletes everything. Another thing I've found that helps performance is setting the WiFi band manually. As I have a pretty good router that utilizes both the 5 and 2.4ghz bands I set mine to 5ghz only. I live in a town house and 2.4ghz can be pretty congested even after turning my antenna power up to 150mv or greater. The 5ghz band is pretty open. I'm getting load times on webpages comparable to my i5 2500k sandy at 4.5ghz and ssd with its 5ghz WiFi n wireless card. This is the quickest rendering tablet I've ever used.
As an aside, the complete re image to stock 4.2.2 from Google might fix reboot problems as well. It seems to do wonders for people with battery and other issues on early n4s. My screen on mine is new but the hardware is from launch day.
Sent from my Nexus 4 using xda premium

Well...
Well, I haven't tried that, but I have heard that many people said the update can help save battery.

i just got the update i was barley able to hit 3 hours screen time lets see how this one lasts.

sotorious said:
i just got the update i was barley able to hit 3 hours screen time lets see how this one lasts.
Click to expand...
Click to collapse
Three hours T h a T Is horrible
Sent from my HTC Ruby using xda app-developers app

My battery life is significantly worse after the update. I flashed back to stock 4.2.2. It seems that the problem with mine is my tablet isn't sleeping. Android os is the highest battery user. Maps is taking a lot too. I have Google now and location services turned on so I'll try disabling those again... No rebooting though
Sent from my Nexus 10 using Tapatalk 2

filthygoat223996 said:
if you are rooted change your processor speed to 1.5gHz, it really helped me get better battery life
so far at 6 hours of youtube with 50% left to go
Click to expand...
Click to collapse
do you mean reducing the maximum cpu clock to 1.5 ghz?