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I'm Xiaomi user also (Mi4C). Battery lasts 2 days (day + night + day), with 2 sim cards active and 4G and wifi enabled also. All automatic refresh (mail for example) is disabled, Facebook app deleted etc. However, I think good battery life is due to xiomi.eu rom.

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I have a Nexus 6P, and, with Doze and all the new stuff, your battery shouldn't be dropping more than ~2% overnight (since you aren't using the phone). If it does, it means some app is waking the phone up constantly.

I use Greenify to kill unnecessary apps running in the background, but the MIUI flavor has that built-in.

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