Its a 6 cell 7.2V 1500mAH.

You can see it on page 15 of the manual found here: http://content.yudu.com/Library/A17o...lideRS10Manual

A battery is included with the vehicle along with a charger. Please note the battery is not a 6 cell stick pack. They are stacked 3 cells on top of 3 cells.

Darin