This high quality 7.4V Li-Ion rechargeable battery pack is made from 6 x 2200mAh cylindrical 18650 cells and comes equipped with a Protection Circuit Board as well as a poly switch for maximum protection. This battery pack is lightweight and has a higher energy density than any standard rechargeable battery, has no memory effect, and has an even longer storage life than an NiMH battery. With this battery module, you can build 14.8V/6.6V ready battery modules in parallel. A built-in IC chip prevents this battery pack from over charging and discharging, prolnging your battery life. Use your Tenergy Li-Ion 18650 7.4V 6600mAh Rechargeable Battery module for your RC cars, RC planes, bike lighting, robots, cameras, and more!