What are droids in Star Wars powered by?

A friend posed this question a while back and despite searching the internet and our collective Star Wars books, we were unable to come up with an answer. I even made this reddit post, but with no real luck. I understand that droids are machines and that they need to "rest" every 100 hours or so to recharge themselves, but what are they recharging? Do they use some kind of batteries? Do they create their own energy somehow? In Episode IV, we see Threepio "switch off", presumably to store power, and in Episode V, Luke plugs Artoo into some sort of power inverter to power his camp. Does anyone have any documentation on what exactly keeps a droid running?

Answer

According to this in-universe schematic, R2-D2 is running Kerdon Aerosystems (or KevDan Aerosystems, depending on the source) hydro-glycolic fuel cells.

_{(Click for large version)}

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