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I'm using my Exchange email account for work with the default Email app on my Nexus S running Jellybean... usually everything works just fine, but within a week or so it'll start consuming massive amounts of battery.

Flushing the data + cache and deleting / reinstalling the Exchange account usually fixes whatever went awry... until the next time the problem comes back.

I haven't tried uninstalling / reinstalling the Email app itself, as the OS cautions me not to do that with a default app.

Is there a way to fix this problem besides "Don't Use It"?

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You can install BetterBatteryStats from Sven Knispel (if you cannot afford it, look here). You get some more insights and can spot some problems with it; the latter link also has a howto and some explanations. Some features require root though. Alternatively you can switch off sync for the exchange account (also programmatically/scheduled with JuiceDefender). – ce4 Nov 29 '12 at 17:39

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