This was one of the smartest purchases I've ever made for my son's XBox. He was eating AA batteries like crazy. It seemed that every time I went to the store he asked for more batteries for his remote controls. I could never remember so he left without much. I decided to try this. I took it upon myself to keep it loaded - if he doesn't remember, he doesn't play. It's about him now, not me. Thank God! And it saves so much money. From the product details, rechargeable batteries are ideal for remote controls. AA batteries sometimes lost contact when the remote was moved. These rechargeable batteries fit snugly but are easy to put on and take off. The charge lasts for several days. When they run out, he charges them overnight and they're ready to use the next day. I am very happy with this purchase.