I no longer wanted to use AA batteries for my Xbox 360 controller. I saw it and it's exactly what I wanted. I don't have to leave the gamepad plugged in to charge them as it comes with a separate charger that plugs directly into the Xbox or a wall outlet if you have an extra adapter. The batteries lasted longer than I expected as I probably used the controller for about 20 hours with one of the already charged batteries and only 50% lifespan. I don't plan on using a cable that plugs into the controller for charging while gaming, but it's still a good idea to have one just in case. I couldn't see how long it would take to fully charge the batteries as I don't need them yet, but it's still worth never using AA again.