My sound link speaker will not turn on.

My sound link speaker will not turn on.

it's fully charged up

ANSWERS:

Have you tried to replace the battery? There are times when on any device such as computers, phones, or speakers, that no matter how long you charge it for, once the charger is unplugged, the battery instantly dies and only works when connected to a power source. Has it ever been in water or possibly water had access to the battery?