This is the GrimRacer 4S 14.8V 5000mAh 40C LiPo battery from AquaCraft.
Features: Designed and tested specifically for boat hulls and boat racing
Includes: GrimRacer 4S 14.8V 5000mAh 40C LiPo Battery with Star Plug Discharge Connector, ElectriFly style Balancing Plug and Instruction Sheet
Requires: LiPo compatible charger and balancer and LiPo-safe charging bag
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 4.2V 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.