Titan Power 11.1v 6000mAh 16C Nunchuck Type Li-Ion Battery (Connector: Standard Deans)

"Best battery on the market, absolutely 0 competition. Fits in the Krtac Trident stock flawlessly and lasts absolutely forever. If you want this battery but don't want or have a Krytac Trident to go with it, you can but the Krytac battery stock separately and put it on any M4 you have or want. Lasts forever, paired with Titan Power's charger, it works flawlessly. This won't fit in most stocks though BE WARNED. Your best bet would be the Krytac battery stock if you don't already have one. But this battery has the best performance and actually doesn't require the same amount of responsibility as LiPo batteries, as it's a LiOn battery. 10/10 recommend as long as you have a fitting stock.

"Fully charged the battery to 12.5 used all day shot between 2000-3000 rounds with this battery used the titan charger to check percentage was at 12.2 still almost fully charged amazing battery's will order more.

"super powerful battery. used this for one day and barely used any of the battery's juice. super capacity

"Awesome battery pack, best there is! Lasts forever and powers Iron man!

"Excellent battery: capacity and power exceeded my expectations! And the number of form and connector options ensures a fitment for any airsoft gun.

My only complaint (and the reason its not 5 stars) is that their 3-stick battery is too long and thick ( ͡° ͜ʖ ͡°) to fit most AEG stocks. The only one I've found that it fits is Krytac's Crane Style Retractable Stock: https://www.evike.com/products/52422/ (oddly enough, this is the exact one in their product images). You could also use the battery-in-pouch-on-stock trick too.