This is a 320mAh 3.7V lithium battery. It is the same one used by the Pocket Bot. The Pocket Bot already comes with this battery, but we offer it separately in case you want an extra one.

Specifications:

• Weight: approximately 6g
• Dimensions: 25.5W x 36L x 4.3H mm

The assembly guide for the Pocket Bot can be found here.