do what we all do: first try a different charger,then if that doesnt work try a different battery,look to see if the battery cycles when plugged in if it does this means it is a good charge port and is most likely a battery or battery port problem,if so clean the battery port with a soft bristle brush and a little alchohol-(rubbing alchohol not booze) if still doesnt keep a charge or show its cycle, then problebly is a battery port problem which will require micro soldering by someone qualified. hope this helps.
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