Rebel 1600mAh 9.6V NiMH High-Output Nunchuck – Mini Tamiya
 
If you want to give your stock AEG a noticeable boost in performance without the complexity of switching to LiPo, the Rebel 1600mAh 9.6V NiMH Nunchuck is the ultimate "instant upgrade." For years, the 9.6V NiMH has been the go-to choice for players who want a faster rate of fire and crisper trigger response while maintaining the legendary reliability and ease of use that Nickel-Metal Hydride cells provide.
 
Designed in a symmetrical nunchuck (split-cell) configuration, this pack is built to fit perfectly into the side tubes of your crane stock or under the handguards of most classic AR and AK platforms.