Complete bullshit, the first one worked for about a day then didn't sit down properly and the second one didn't work at all. Don't waste your time as I've seen too many other crappy reviews about it.
Works as a good and cheap replacement in case the battery cover that comes with the controller gets damaged or lost. My only complaint is that the rechargeable batteries are very tight and incredibly difficult to remove without damaging the plastic.
One of the two was broken and I had to glue it together. The other had to be cut off to fit my authentic controllers. They "work" but are not perfect. You really feel like they break every time you change batteries.