[Asus  Eee Pad Transformer Prime] demandarin:
thanks for posting this. I think I can slightly see what's going on, based on this. Your device is unable to stay in a steady deep sleep. wakelock means your device woke itself up out of deep sleep. this causes the battery usage to go up because its not staying in deep sleep. deep sleep is the place where battery will be used up the least. once device wakelock or wakes up, battery drainage shoots up or increases. Your specific prime is draining battery faster because you have processes that are causing your prime to wakelock more often. therefore draining battery faster than usual.

Your first culprit looks to be Google maps. this is a known issue people reported having it run in the background when they didn't even activate it. couple of ways to tackle it. one being going into setting then apps. then finding Google maps and manually force close it. Another way is to use an app, like system tuner, to stop Google maps from running at startup. it'll allow you to stop what ever apps you want from automatically running on boot/startup and running in the background. Another way is to see is ICS app settings lets you deactivate Google maps from running at startup.

The other culprit seems to be your gmail. What is the sync frequency you have this set to? the reason I ask this is because if you have it set to some kind of high frequency, like check every 5mins or every 10 mins or every 15mins, then this is a major reason for battery drainage while device is in deep sleep. look at it like this. you put your device to sleep. then every 5 or 10 mins or whatever, your device wakelocks aka wakes up out of deep sleep to check for new email. this is causing your battery drainage to increase because the device woke up and is not in deep sleep anymore. Ask yourself, do I really need my gmail to check for new emails every few minutes? I hope not because you will never see good battery life while in deep sleep or not in use. I have mines set to check every hour. if you want, you can have it set to Never and have it only check for new email when you manually open gmail app.

So same kinda applies for Google maps. if this is constantly running in the background or causing wakelocks, when device is in deep sleep, I can see why your battery life is bad. its little things like this that cause major battery drainage and people miss these kind of things happening. its easy to blame the obvious. these things seen in your better battery stats is stuff that's not obvious and would've never been known if you never installed that app.

Another tip, which will have a huge impact on your battery performance, is to go into prime settings, then account & sync. check what syncs you have enabled. disable anything not used. also go in and cut down the frequency of the syncs. when you have stuff syncing very frequently, this can cause huge spike in battery drainage. I cut off all stuff I don't need it use. then on the others I cut down the frequency of the syncs. some apps, by default, plant their syncs in your prime to sync very often. this will greatly add to your battery drainage.

last tips are to cut off haptic feedback. everytime that vibrate motor goes off, it drains more battery than usual. Also don't use Auto brightness. manually set your brightness. don't have it up so high if its not needed. the higher your brightness setting, the faster your battery drains. I always have my brightness set to 25% or less. at least for me, that's good enough. if you concerned about battery life, this should be important to you also. if you have poor vision and need it brighter, that's fine. just make sure to do the other things listed to get the most out of your battery. another huge factor is what time you set for display to city off when not in use. this will make a huge difference in battery life. I have my display to cut of in 30 seconds when not in use. you can even set it to 15 secs. the longer your display stays on, when device not being used, the faster your battery drains. the faster your screen cuts off when not in use, the more battery life that is saved. Also know that web surfing, since its ram intensive, drains battery fast, especially if watching flash video or loading flash ads. try going into browser settings and set flash to "On Demand". so flash ads n movies won't automatically load up everytime. you can load up any flash video if you want. I'm rooted and use Adaway, so my web browsing is very smooth and battery life is better because my web browser has all flash ads or ads blocked.

Keep using better battery stats to see what's going on in your prime. go into there settings and go to the help section. there you will find out all the details on what you are seeing going on in the stats. it explains all the terms shown in stats and also tells you how to increase your battery life. most of it being what i explained in this post. it'll tell you about wakelocks, partial wakelocks, rogue apps, etc...

---------- Post added at 08:40 PM ---------- Previous post was at 08:39 PM ----------

read my post above. might can help you figure out why.