Review on Xbox Rechargeable Controller Battery Packs (2 Pack) With 4 Matching Covers And Micro USB Charging Cable - Compatible With Xbox One/Xbox Series X S And Elite Wireless Remote - Play And Charge Kit by Nate Skinner

At first I couldn't put the battery in the controler because it didn't seem to fit and I got worried that I'd have to use normal batteries .But the trick is to put the side where it charges from ( on the top of the battery not the side where the charging port is ) in first then push the back down and it will snap on place .It will be a tight squeeze but it will fit and won't fall out .The good thing is once the battery in the controler turns green you can plug the other one in and charge it with out it being in the controler so you will always have a fully charged battery ready to keep playing .5/5 stars