Beach RC says... This is the Ultimate Racing 4S 120C 15.2v. 7500 mAh Graphene HV Stick LiPo Battery Stick pack.
This 4S battery is a standard size equivalent to two 2S stick batteries and weighs approximately 560g. It comes with an XT90 connection to avoid false contacts and a separate balancer cable to only connect it in the charging process.
Voltage: 15.2V (2S)
Dimensions (mm): 138x46x49