Rechargeable Battery Pack for X-box Series X|S/ One, 2 Pack 4440mWh 3.7V Battery Pack for X-box One/One S/One X/One Elite All X-box Controllers Supports Use While Charging (Includes 2 Batteries Only)

They work very well with the xbox series x controller. They honestly surprised me. It’s super easy to to put in and take out. you can still put the back cover on and everything feels normal. You don’t have to recharge it every-time you play.

Holds a good charge, great value for 2 batteries. I charge it daily and it hasn't ever come close to dying on me for over a year.

One battery works great, while the other doesn't hold a charge. Still a good price for one battery.

It comes with two block of batteries and it did the job pretty well like 18 hrs straight after fully charged.

Plain and simple. They don't charge. At least, of course, mine didn't it. I put them in the controller correctly, I double checked. Plugged the controller (battery inside) into a charger (FOR 24 HOURS!!). Noticed the icon on the top right of the Xbox Home Screen displayed as advertised (a battery with a little lightning bolt icon, signifying a battery charging up). I unplug it, hold down the xbox home button (to power on the controller and system) Nothing happens. Battery is dead. Useless item. I suppose being cheaper than every other option should've told me something. I just thought they skipped all the unnecessary "come with batter charging bank" hoopla and just simply sold rechargeable batteries. But, nope, lesson learned. But of course, I'm supposed to believe mine are just duds and "this has never happened before" or "we're so sorry to hear that".