this battery pack does what it is supposed to do. But . . . the first time I charged it from the Wii USB port, the charge light came on for one second and went off. The next day, I put it in the Wii Fit balance board and it worked so it must have charged just fine. However, it only ran for about four hours over the next three days before it died. So I charged it again and I'll see how long it lasts this time. If it has to be charged every third day, it will be a pain in the neck. But if it holds the charge for the advertised 20 hours it'll be a bargain.
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