Battery Drainage

[Diogo Nóvoa]

So, I am using a xiaomi mi5 and I get like 2 hrs a day of SOT. I want to know what's wrong and what can I do to improve this. When I wake up my phone is always with no battery, unless I put it in airplane mode. It's supposed to be "Android System" related.
I am using a miui 8.1. 2.0 stable. Other informations are in annex. Maybe try and change my ROM?
Please help, it would be very appreciated.

 

[mixxamm]

You are using an outdated version of MIUI. You can download the latest version here: http://en.miui.com/download-299.html

In updater app, use "select update package".

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