Why doesn't my battery charge beyond 35?

A

AC Question

my battery can't charge beyond 35%

i have an htc one m8 verizon.my battery doesn't charge and when it does it extremely slow. i get like 20% in 3-4hrs of charging. but then it keeps dropping considerably while on charge. so it keeps going back n fourth. i have tried calibrating the battery, doesnt seem to have any improvement. please help
 

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