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I don't know how good this battery pack is, but all you need are good AA rechargable batteries. I use some 2400+ mAH Energizer batteries and they work great. When getting rechargable batteries look at the mAH (Mega Amps / Hour) Get some that are 2000 or better. They may cost up to $5 each, but they will last forever and last a while between charges. I get about 20 hrs on the Wii with the Nunchuk (tracked with Zelda), a lot more w/o the nunchuk, but harder to track exactly.