This is the GrimRacer 2S 7.4V 4200mAh 30C LiPo battery from AquaCraft.
Features: Designed and tested specifically for boat hulls and boat racing
Includes: GrimRacer 2S 7.4V 4200mAh 30C LiPo Battery with Star Plug and Discharge Connector and ElectriFly style Balancing Plug
Requires: LiPo compatible charger and balancer
Voltage Rating: 7.4V
Rated Capacity: 4200mAh
Discharge Rating: 30C Continuous, 60C Surge
Max. Recommended Charge Rate: 1C (4.2A)
Discharge Lead: 10 gauge wire with Star Plug
Balancing Plug: ElectriFly style
Dimensions: 5.28x1.65x.75 (134x42x19mm)
Weight: 8.25oz (234g)
Note: Always use a LiPo-approved charger, LiPo cell balancer and set charger’s output volts to match battery volts. Be sure to charge in a fireproof location and keep out of the reach of children. Never Charge over 4.20V per cell, allow LiPo cells to exceed 140°F (60°C) during charging, charge at currents greater than 1C, allow discharging below 2.5V per cell or trickle charge. Do not disassemble or modify pack wiring in any way, puncture cells, place on combustible materials or leave unattended during charging.