I've had my Z1 for 3 years now, it was 2nd hand when I got it. a few months ago I noticed the battery started running low very fast, so I bought a new battery. The battery however is still doing the same thing, and will not charge past 81% charge (I have tried different chargers, and STAMINA mode). I took it to my local mobile repair store, and they told me it's mot likely not in fact a battery problem, but a problem with the phone's motherboard, and it is irrepairable 
Has anyone else experienced this? Got any ideas on whether or not it can be repaired? All other functions of the phone are working fine....
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