What is the problem to my Beats by Dr. Dre?

Cha Cha

New member
The left headphone has less volume overall then the right headphone, what is the problem? I googled and seen something about the "battery" being bad, how can I replace the battery? I haven't had the headphones for too long, so they are in great condition. (And no answers about warranty please, I don't want to hear about that)
I said don't tell me anything about warranty...
 
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