See: Modelix Racing

Modelix Racing have introduced the new Ultimate Racing 15.2V 7500 mAh Graphene LiPo High Voltage battery pack. The 4S battery measures 138x46x49, or the standard size equivalent to two 2S stick batteries and weighs approximately 560g. The battery is built from Graphene LiPo cells that offer up to 120C discharge rates and a very low internal resistance for high power output. The Graphene 4S 7500mAh LiHV battery pack comes with an XT90 connection to avoid false contacts and a separate balancer cable to only connect it in the charging process.