[myTouch 4G General] shlongwoodian:
Ok, I've yet to see any actual, 100%, absolute explanation (not even caring about a fix, just a reason) about why Android OS and Android System get up to 70%, 80%...even 90% on certain devices.

I say "certain devices" based on what I'm about to discuss...

Ok, so my fiancee and I both have a MT4G. I ordered a replacement for mine, due to creaking issues. The replacement (brand new, retail packaging) phone TMO sent was defective. The subsequent phone they sent is *flawless, IMO so I'm all set as far as phones go. Now on to the details...

Pretty much right off the bat, I noticed how great battery life was on my phone. Especially after reading others' posts about the phone being dead by 11 AM. I'm a geek by trade and nature, so I keep my devices pretty lean. I don't install a ton of apps, particularly, ones that run services and that sort of thing. It's a very short list of relatively "static" apps on my phone. On my first MT4G and now on this replacement, both are getting well over 12 hours of battery (I might post a new thread discussing how my LATEST/final replacement actually gets 24 hours of battery life...but that's a whole 'nother TV show).

I of course have USB Debugging enabled, as to use the Android SDK, well, ADB. I also rooted my device (the first and the replacement) via VISIONary. Even before rooting, both the first phone and its replacement were A) getting well over 12 hours of battery life and B) Android OS and Android System always stayed quite low, as far as battery usage (e.g. single digit percentages).

My fiancee knows her way around Android but isn't as into this stuff as I am. She didn't have USB Debugging on nor did she root her phone. She went out of town last week and the entire time, she's reporting back to me letting me know her battery is dropping SERIOUSLY. She isn't a heavy-user, so to see the battery down to like 60-70% by noon when she'd only sent a few texts and opened up Facebook, was a bit disconcerting. And no, she wasn't playing Angry Birds w/ the Display consuming all of her battery.

When she got back, I immediately enabled USB Debugging. I went through all of her apps to see what she'd installing, believing she MUST'VE installed some silly ring tone or wallpaper app. She's had Watchdog installed since day one, as per me, just to keep an eye on that sort of thing - it's showing NO offending apps. She really didn't have any silly apps.

Nonetheless, her Android OS and Android System were WAY up as far as battery usage goes - i.e. always above 70%. I was still not willing to rule out user error - i.e. "you did something."

I rooted her phone, backed-up all of her goodies and did a Factory Reset. I let Google download her previously installed apps and didn't restore anything else. Again, her app list was short. The most "far out" app was Handcent. Even after a Factory Reset + USB Debugging enabled + nothing extra running (i.e. a verbatim list of processes as compared to my phone), her Android OS and Android System were still cranked up way high by the middle of the day.

I decided to "experiment" with the USB Debugging "fix" and see if I could truly validate that. I took my first MT4G that I've yet to ship back (TMO's letting me hold on until I verify my new phone is fine, which it is) which has been Factory Reset. I didn't re-root it and I left USB Debugging disabled. The first experiment was to just leave it as that and let it run all day. At the end of the day, Android OS and Android System were still way low. The next day, I used the phone a little more - in the same state. I'd unlock it, launch apps, etc. I didn't make any calls though. At the end of the day, still no crazy-high percentages for Android OS and Android System. So it wasn't the most air-tight testing, but I can say that w/ USB Debugging disabled and general usage (sans phone calls), those processes never used up more than a minute or two of time, relative to the battery. I Factory Reset her phone again, only to get the same result.

So now I've (not very scientifically) narrowed it down to "her device" or "something that's coming over with your Google profile."

When TMO sent me my second replacement phone, the dude made a mistake and sent me two phones - the retail/new replacement and a non-retail packaging phone (sans battery, battery cover, etc.) I figured since we had this extra phone, let's do some "testing!" I set her up on that phone, letting Google restore the exact-same apps and didn't root or restore anything at first. On this phone, she is seeing what I'm seeing on mine - i.e. Android OS and Android System are always in the single digit percentages. I did NOT disable USB Debugging at first, for her, the phone isn't rooted, etc. She's getting well over 12 hours now and those two are staying in the single digits.

So it would appear as this issue is device-specific. I know people have said one of two things causes the Android OS and Android System to get up to 70-90% - i.e. the init process and the standby process. I'm just not sure if I'm buying that. Now, I'm not saying what the issue IS but I can say this:

- On her original phone, no matter how many Factory Resets, rooted or not, her battery was dying crazy fast and the culprit appeared to be Android OS and Android system having consumed 4+ hours of battery life (to process the SAME amount of data as on my device - i.e. 40-200 KB sent/received for Android OS and/or Android System; my phone showing those two only ran for a few minutes after an entire day). On the other MT4G TMO sent, she has yet to see Android OS or Android System get out of control - i.e. they are always in the low, single-digit percentages. She's using the phone in the same way, makes a few calls a day, sends a few texts, looks at Facebook, plays Angry Birds, etc.

My point is - this *

appears

* to be device specific.

I can't think of any other explanation, considering she had the same issue over and over again on device #1, yet on device #2 (which has her same Google profile + same apps that Google restored), it's yet to crop-up once. After seeing things remain steady, I've since rooted her and restored her Angry Birds data. :) All is still perfect for her.

Sorry for the long post but this seemed to be the most appropriate thread to post in. I didn't want to start another topic regarding battery life. This is more than just, "boo hoo, my battery life is poor." This isn't a case of runaway apps, debugging being enabled/disabled, crappy batteries (we've swapped out with known-good batteries), etc.

The only thing we've come up with is, deferred calls. She has a handful of deferred calls, so we considered that as being the culprit, but again, I can find no evidence of that triggering any runaway processes though. Add to that, the same deferred calls exist on her new device. That's why I'm inclined to say "it's that device."