This comes with two rechargeable batteries for the Wiimotes, but the battery life is incredibly short. No matter how long you leave them on the charger, they will only hold about an hour's worth of charge, and part of that isn't that useful since the wiimotes don't detect motion very accurately when the power gets low. The wiimotes also have trouble fitting in the charger dock if the wrist straps are attached and the wrist strap covers the light, so you either have to deal with that or disconnect the wrist straps and reconnect them every time you have to charge it. It's just not worth it.
The ultimate charging solution for the Wii U! This 3X Conductive Charging System allows you to charge 2 Wii U Remotes and a Wii U Gamepad at the same time. Includes 2 Energizer Recharge Battery Packs for the Wii Remotes, an AC Adapter for quick charging, and 3 LEDs indicating charging status.