TKOOFN 4 Packs 2800mAh Rechargeable Batteries & 4 Ports Charging Dock for Nintendo Wii Remote Controller Backup and Replacement - W0016 Enjoy your game by uninterrupted power supply 4 X 2800mAh batteries for strong backup 4 charging ports allow you to charge 2 remotes and 2 batteries simultaneously CE/ROHS certificate, overcharging protecting Can be recharged up to 1000 times