Hi @D252, sorry to hear about this. 
Is the battery just running out faster than before, or do you experience any behaviour with the device for example, shutting down even though you have plenty of battery left? If you could elaborate a bit on the exact behaviour, that would be awesome!
If you experience battery drain, try restarting your device in safe mode so we can see if any of your downloaded applications is the cause of this, as they are temporarily disabled in this mode.
Keep me posted with how it went!
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