Suprised by battery

Mikoz

New member
Jun 28, 2013
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Hello everyone!
Today I had my phone battery level at 63% when i decided to plug it to my PC with USB to upload some new stuff into the phone. It was plugged for about 3 mins. After plugging out i realised my battery is fully charged. It suprised me a bit. Then i turned on Wi-Fi connection and got an update for some google apps. It took me 1 min to get it. After that battery level dumped to 50%. Is anything wrong with my battery or I'm just too much worried about the situation?