U Boom L battery?

Hi Friend,

Thanks for choosing EarFun.

Our batteries have overcharge protection and will automatically stop charging after being fully charged.

If you have a warranty claim, please email our customer service team via service@myearfun.com or submit the warranty ticket on our official website: https://www.myearfun.com/process-warranty. EarFun provides an 18-month warranty for every product. Your satisfaction is always greatly important to us.

Sincerely,

EarFun Customer Service Team