The battery connector used is this connector shown below

 XHP-2:

http://www.digikey.com/product-detail/en/XHP-2/455-2266-ND/555485

and the appropriate mating connector is 

B2B-XH-A:

http://www.digikey.com/product-detail/en/B2B-XH-A (LF)(SN)(P)/455-2247-ND/1651045