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What's the best way to fix a high battery drain?

I had been using an old nightly build on my HTC One (since no stable had yet been released for it), and I had no battery issues. Just sitting in my pocket all day, the battery would still be at 75% by day's end.

Then I upgraded a week ago to the most recent stable (CM 11-20141112-SNAPSHOT-M12-m7), and now my battery's completely dead in about 3 hours even if I don't use my phone.

The battery statistics app says that the "Mediaserver" is consuming 45% and "Google Services" is consuming another 39%, which seems insane. Historically, "screen" is usually the biggest consumer, but that's now at only 8%.

Googling shows this is a common problem with CM, and there's a ton of different causes and fixes. What's the best solution? I picked a stable release because I thought...well, it would be stable and relatively bug free. It seems counter-intuitive to upgrade to a nightly to fix one bug, while likely introducing more.

A common solution mentioned is to "disable Google Now", but I don't have any such app installed.

Another solution is to disable location reporting for Google Services, but they don't mention how. I think they mean disabling location reporting under "Google Settings", but this effectively disables all apps that use GPS, and I use Google Maps and Navigation quite frequently.

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