Lithium battery, similar to link but doesn't have to be that one. Prefer 2-3 cell, at or above 5000mAh

Original Store: http://www.amazon.com/dp/B005FUKQ2W/ref=wl_it_dp_o_pC_S_ttl?_encoding=UTF8&colid=2VRVBNR6VQZHV&coliid=I24WB6O1GZH10H