These batteries are quite difficult to install into the controller. I broke the tabs on both trying to insert them. They're still working, so they get three stars. They run for about 8 hours of playback, but when they suddenly die, often without a low-battery warning. I have to keep charging one because they die mid-game without warning. I would not buy them and will buy another brand when they are no longer effective. It's just not worth the money when there are other potentially more effective and easier-to-use products out there.