Help Battery Problems

[androidgirl20]

My Nexus 7 used to charge fairly quickly and have very good battery life. Now the battery drains much more quickly and takes forever to charge, causing me to reboot the darn thing. Rebooting does fix the charging issue, but only temporarily. Once my battery has drained a significant amount and I am ready to charge it again, the same thing happens and I have to reboot.

This is pathetic. This tablet is supposed to have great battery life, and then something changed.

Suggestions? I'm considering a factory reset, but only as a last resort. My device is on 4.2.2.

 

[CharlzO]

It sounds like there's an app that's using a lot more than it used to. There are apps to help show that (Watchdog, I think is one? I don't really know, I haven't used any), but you might be able to tell under the Battery menu, to see if there's anything showing abnormally high usage. I wouldn't go with the reset JUST yet, before trying to narrow down what's draining you down. But the way that a reboot fixes it temporarily seems to imply an app gone haywire.

 

[El Presidente]

Yeah, watchdog watches CPU usage and will alarm if anything starts using more than it should.

Also look at GSAM Battery Monitor which gives an historical overview of what apps/processes are using the battery so you can pick out any apps that are misbehaving.

 

[Daxst3r]

I've given up trying to work out what the battery is doing on my N7.
To explain more clearly, the battery voltage ranges from 3600mV (dead) to 4210mV (fully charged).

Sometimes the tablet reports 100% all the way down to 3800mV

Sometimes it reports 90% at 4000mV.

Sometimes it reports 30% at 3600mV and then shuts down unexpectedly.

Sometimes it thinks it's fully charged at 3900mV...........

What might be happening is your N7 isn't charged full when it says it is, so your unplugging it at 100%, but it's actually closer to 50, 60, 70%.

Get an app like "battery monitor widget" and set up a widget to show the battery voltage, remember 3600mV to 4200mV and then completely ignore the percentage from now on.