Since the last update, my FP4 drains battery, it lasts about 6 hours. I first did a factory reset but then I also did a full reinstall of the system (with fastboot and recovery mode). But the problem remains. And I didn’t install new apps since this issue - I also reduced the number of apps after I did the reinstall of the system.
I can also feel that the device is warm (not much but it is clear, that it doesn’t sleep deep) - so it is also clear that the phone works too much, but why.
If I do a “logcat *:E” is get nearly every second this message:
07-02 11:09:05.591 1552 2449 E BatteryService: getUsbNTCTemp temp30.9
07-02 11:09:09.828 1552 2449 E BatteryService: getUsbPresent version1
The battery of my FP4 is also draining quickly since several days (battery life about 12 hours when on standby). From the output of top and logcat, my problem seems to be very similar to this one:
Mine is currently also draining fast er, however for me already before the update and not each day the same… Didnt check on this further. Maybe its good to send your logcat to support?
I managed to fix the problem by setting the preferred network type to 2G (reachable on my Dutch-language phone via Instellingen → Netwerk en internet → Mobiel netwerk → Voorkeursnetwerktype). The battery drain (and the error messages in logcat) only seem to happen if the network type is set to 3G or higher.
Coming in here to mention that I have the exact same issue! I been noticing a drop in 30-40% every night, and I don’t have the option to charge my phone at night, so this is REALLY annoying.
Has anyone contacted/heard about it from the official support yet? I contacted them this morning via E-Mail, will have to wait a few days for a response likely…
I also tried checking if any apps are draining my battery in “Battery Usage” in my settings, however every morning when I check, all it shows me is ~ 2% Screen and 3% Mobile Network, nothing else.
The support got back to me and told me to do a factory reset… after saying that I’d rather not factory reset my phone for an issue that apparently seems to be caused by their Android update (and thus likely will just happen again once I update my phone), they told me to replace my battery…
Can ANYONE ELSE confirm that this issue is fixed by factory resetting your phone or replacing the battery?? I’d really rather avoid messing around with my phone like that, only for the issue to reappear, but the support seems to completely ignore the possibility that this issue is caused by the Android Update and should be fixed by them.
What have you done to find the route cause of the issue? Doing a factory reset btw does. Ot touch the OS so if the OS is the issue really it will not help.
I haven’t really been able to find the root cause of the issue myself yet, all I know is that it’s been happening since the last Android update and that the battery doesn’t drain if I put my phone on airplane mode.
I’m very hesitant to simply try a factory reset if I’m not even sure that this would fix the issue, though, since that would mean hours, and likely weeks of effort to try and restore everything necessary on my phone and then still lose a ton of stuff. And doing all that, when it might not even fix the issue seems painfully counterproductive.
My Wifi connection is stable (and turning of Wifi itself doesn’t solve the issue, only airplane mode from what I can tell) and I’ve already tried Safe Mode with no difference. I will try taking out my SIM.
so i’ve had my SIM out for about 4hrs and left my phone to mostly idle and can report a power loss of about 2-3%, which is significantly less of the 5% per hour i had before
especially not all of it 
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