37 volt 4000mAh 15C - 60+ amp - This 10S2P 'Big Pack' is built from our 2000mAh - 15c cells. It is rated and has been tested at 60 amps continuous discharge with burst capability of 80 amps for 5 seconds every 30 seconds. Dimensions: 40mm x 50mm x 350mm Weight: 1200 grams Check the specs (size and weight) for all our big packs.