This is the EcoPower "Electron" 4S 2000mAh, 20C Lithium Polymer battery pack. This battery is perfect for your starter box! It will significantly reduce the weight of your starter box, as one of these batteries will weigh less than two 7.2V NiMH batteries. Plus, the battery will provide increased voltage and the punch needed to get those tight engines fired up. This pack includes a factory installed T-Style Ultra connector and 12awg wire to provide a durable and low resistance connection, combined with a 5-pin XH style balance connector.