How long the vivofit battery last and how to recharge it?

Vivofit does not have a typical rechargeable lithium battery. Instead, Vivofit has two standard watch batteries that give the device a battery life of up to a year without the need of replacing it. It is amazing...isn't it? Where most other fitness trackers pack the typical rechargeable lithium battery, the Vivofit uses two standard watch batteries. This gives the device a battery life of up to a year, at which point you can just pop in a couple of new cells. http://www.pocketnavigation.de/wp-content/uploads/2014/03/vivofit_batterie.jpg