Solar Powered TI-82?

numlumps asks: "Recently, my batteries for my TI-82 ran out of juice. Since there is no environmentally friendly way to dispose of batteries in my area, I figured, why not do away with the things altogether? I figured if it were possible to power my calculator with solar power, I'd never have to buy batteries again, nor would I have to worry about toxic chemicals from old batteries leaking into groundwater and so on. Has anyone built a solar power kit for TI-82 and similar calculators? If so, how do I do it without ruining my calculator?"