I've got a little panel I picked up from Harbor Freight for about $15 on sale. It holds two AAs and I have two well lit windows near my wii, so I figured instead of getting a charger that used electricity, I could use this to charge my wii controllers' batteries. It doesn't do much though. Has to be in VERY direct light, like outside. I think I've charged maybe 4 AAs in it in the 9 months since I got it.
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