TBS Graphene - with lots of it inside, seriously! It's the pack to get you through your training runs economically!
The TBS Graphene packs are here! You get power when you need it, without regret. It takes a lot of abuse and doesn't set you back much from the start. The high discharge rate will provide a stable voltage despite high Amp draws, without sacrificing the lifespan of the battery. Give them a try!