Accessories by OtterBox. Details:Why do controller batteries always die at the worst possible moment? With Power Swap Controller Batteries, that's a question you never have to answer. Power Swap Controller Batteries cut the cord and set you free by delivering uninterrupted gameplay and zero controller downtime. The quick-release batteries swap on-the-fly with one hand during gameplay, no pause needed. Low battery indicator lets you know when it’s time to find a safe place in the game to swap batteries and maintain game dominance without loss of power or controller connection. The included dock charges both batteries simultaneously and keeps the backup battery fully charged until you need it. Power Swap Controller Batteries deliver all the power you need with the gaming industry’s FIRST on-the-fly hot-swap design that keeps your attention where it should be, in the game.