will always be Lipo 6750mAh 4S - 14.8V 55C constant 110C 5mm Bullets (Si-Graphene) Design for anybody 10 min long main. The hardcase battery pack weighs in at 534g. more or less 2 light weigh LCG pack battery pack. Perfect for outside 1/8th scale rushing. Completely new bullets connector make wiring more pro. Design to attempt high KV rating engine.