This is the Venom Racing 15041 18.5V 2500mAh 50C LiPo Battery.
Thoroughly tested and rated at a continuous 50C, these packs are capable of 7-10 second bursts at 100C and are available in a wide variety of capacities and configurations to fit almost any power application. Perfect for airplanes, helicopters and boat applications. All of Venom's 50C LiPO battery packs feature heavy gauge wire leads.
One Venom Racing 15041 18.5V 2500mAh 50C LiPo Battery
LiPo capable charger
Connectors of modeler's choice