HT201263 iphone only shows logo for 13 seconds when connected to pc thats all it does however i connected to wall socket it goes up to connect to itunes but when i unplug it then it switches off

iphone only shows logo for 13 seconds when connected to pc thats all it does however i connected to wall socket, it goes up to connect to itunes but when i unplug it then it switches off.
this is coincidently after an ios update for iphone which i did just approx two days earlier which was suppused to fix battery issues?
also battery shows 100 percent full but as i explained if disconected from socket it switches off altogether.

Hopefully and most likely faulty battery. If you have Warranty or AppleCare, make Genius reservation and take to Apple for resolution.

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