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Author Topic: Battery problems  (Read 1593 times)

Offline DoctorOHM

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Battery problems
« on: December 16, 2012, 02:03:52 PM »
So I've been having battery drain issues over the last 10 days.

I read through this thread, and downloaded OS Monitor, but nothing is jumping out at me, and I still don't know what I'm doing:  http://nexus7forum.com/nexus-7-help/a-raw-newbie-with-a-couple-of-questions/

I also downloaded the smart quick settings app.

I normally leave the screen brightness as low as possible unless the charger is connected while I'm using it.

I never turn on Bluetooth, and I turn Wi-Fi of if not using it. I try to be very conservative with energy, but around 10 days ago I noticed a big drain one day, while off- charger and on Wi-Fi. I thought maybe it was over, but I'm still having trouble. Friday night I finally began notating the drops, and how slow it charges now.

I've deleted all apps I downloaded the day I noticed it, and a few other ones besides.

I bought my tablet mid September and until recently, just reading Pocket, PDFs, etc with no Wi-Fi on used about 7% an hour. WiFi web browsing was about 10%. If using web while charging, it works usually gain about 14%ish an hour despite Wi-Fi on. In sleep mode (which I use more than turning it off), it gained about 25% poet hour of charging, asleep with WiFi off.

But now I lose anywhere from a quarter to a third more energy, WiFi or not!

Seems to use about 10% or slightly more, even reading offline. Wi-Fi browsing is probably 14% or more now. The first day I noticed it, I was using Wi-Fi/discharging for 3 hours. Before, that would have put me down to around 70% from a full charge, but instead I was at 61/62%.

Smart quick settings points me toward " Android task manager" when I try to see what tasks are running. I don't know if it would be anymore helpful than OS Monitor. It also says cellular data is on, but I assume that's a weird fluke, since I'm on a 16gb n7 with no such plan/ability.








Offline DoctorOHM

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Re: Battery problems
« Reply #1 on: December 16, 2012, 02:18:54 PM »
Asleep, it still charges around 25%, no Wi-Fi.

I've heard the battery gets crappy for a week after updates, but I think this started a bit after my last update. And it has gone on longer than a week.

Offline bjs229

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Re: Battery problems
« Reply #2 on: December 16, 2012, 05:45:48 PM »
I agree. My battery life has gotten shorter with the last update. I dropped my nexus a while back so I have been hesitant to post about some recent issues just because I can't be sure of my findings. I haven't timed anything per se but I find myself having to charge more often with the same use.

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Offline matt

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Re: Battery problems
« Reply #3 on: December 16, 2012, 10:54:27 PM »
Settings\wifi\ menu at upper right\advanced-turn off wifi when asleep. And wifi optimization.
Settings\more turn off nfc.

Offline bjs229

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Re: Battery problems
« Reply #4 on: December 16, 2012, 11:04:45 PM »
NFC.. Good idea. I never use it.

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Offline DoctorOHM

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Re: Battery problems
« Reply #5 on: December 17, 2012, 01:56:36 PM »
Bjs229: yeah, I saw a thread where someone implied it was drop kicked...?!

Well if anything I can confirm it's not just you, and there have been some reports of people having problems after the update.

Matt, doesn't. Airplane mode kill NFC..?

I've had airplane mode on since yesterday, and can't see a reduction in power usage. It's on right now!

Offline matt

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Re: Battery problems
« Reply #6 on: December 17, 2012, 02:30:13 PM »
I'm not sure what all airplane mode does, allthough I'm leaving it on. I thought it was to shut down all transmission, but wifi and bluetooth work anyway.

I've got a clock lock widget that shows weather info. Maybe it turns on wifi while the tablet is asleep to update.

The battery info may not be too accurate, try cycling to near full discharge a few times to calibrate it.

To hold a longer charge, turn the tablet completely off by long pressing the power button. It takes a few minutes to cold boot, but also helps clear the crud from the system.

Sometimes when charging, I'll notice the battery graph isn't rising like it should, indicating a trickle 1/2 amp charge instead of the full 2 amps. Reconnecting the usb fixes that. Hope it's not the jack.

There's a lot of secrets in this open source os aren't they?

Offline bjs229

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Re: Battery problems
« Reply #7 on: December 17, 2012, 05:10:28 PM »
I thought airplane mode is for use on a plane as to not give off frequencies that can clash with the planes electronics.

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Offline DoctorOHM

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Re: Battery problems
« Reply #8 on: December 19, 2012, 07:48:24 PM »
Well, the check next to NFC disappears when I activate airplane mode.