Jelly Comb Xbox One 2 x 2000mah Battery Pack and Dock | $30 | Amazon | Promo code JCXBOX88

There are a lot of Xbox One controller battery pack sets out there, but most of them are only 1,000-1,200mAh. This pair from Jelly Comb will add a hump to the back of your controller, but give you 2,000mAh for longer playtime, plus a dock to charge them between uses.