JBL Xtreme - How to charge it?

[CC07 PEU]

Does anybody here own a JBL Xtreme and if so do you know how to charge it?

I plug it in to the charger and a white LED light flashes. What does this mean?

If it means it's charging then I must have a defective speaker as I got no more than 15mins out of it at full volume tonight!