Kong Power 1300mAh 20C 11.1V stick single pack lipo buffer tube battery.

Fitted with mini Tamiya connector
Size:125(L)x22(W)x20(H)mm / cell

When using 11.1v Li-Po batteries in upgraded AEG's, it is advisable to have a total upgrade, including spring, cylinder-parts, gears and motor. Simply installing a more powerful spring, and then using a high voltage battery to power the AEG will wreck one or more components in your gearbox.