Why is my battery life suddenly really bad?

sl55555

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Oct 3, 2015
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why is my battery life suddenly really bad?

i have an S5 and ever since i got it. the phone would heat up so hot so quick! but it never really bothered since the phone ran fine.
but recently my battery life is sooooooo weak! and it takes forever to charge my phone!
i know you shouldn't use your phone while its charging and i did do it sometimes but not too often cos normally my battery life can last me all day. now im on 50% after an half an hour of using it.. like i said my phone takes it time to fully charge even when im not using it. and when i do use while its on charge the battery actually goes down! i know i shouldn't use it when its charging but this has never happened before it normally just charges anyway. whats wrong with my phone and how i can i fix it!!??? please help me someone!