Package includes: 2*7.4V 5200mAh battery pack, 1*7.4V battery charger, 2*cable connector, 2*DC5521 male connector cable Battery size: 70*50*40mm (L*W*T),Battery weight about 195g, 7.4V charger cable length 90cm. Premium battery pack: Build in protection board, prevent battery from over-charge, over-discharge, over-voltage and short-circuit. Each battery pack is build with premium batteries to provide your devices powerful energy. Long using life: this 7.4V battery pack build with lithium-ion battery, no memory effect, is of over 1000 times charge-discharge cycles. After sales service: please feel freely to contact with us for customer support if you have any probelm with the product. Your inquiry will have our prompt reply.