Arrowmax latest 7.4V 2S 8200 Si-Graphene 120C Touring LiPo battery. Target focus for the current competition touring market. With the Current stock market needs, The New Si- Graphene Formulation provides excellent consistency on Internal Resistance. Size at 139*47*25.1mm with the weight of 320g, it is ideal for outdoor stock class, this battery pack delivers a low internal resistance and a relatively high average voltage platform over a 5 to 6 mins run. "Less fade" is the key point of this battery pack for the highly competitive stock class market.