Gens Ace Redline 2.0 Series 2S 140C 5100mAh Hardcase LiPo Battery Pack; with a factory installed 5.0mm bullet. Consumers trust the Gens Ace name to deliver the dependability and high performance they expect. The Gens Ace 140C 2S 5100mAh 7.6V LiPo battery pack has a high-capacity; high-discharge rate that gives you the power and run-time you expect .