>>237
Well shit, that's even cheaper than GP NiMH AA at 0.89 USD/Wh. The reviews sound good too, with some claiming 70% capacity after 1000 cycles.
I don't know much about 18650, do they generally all have the same minimum voltage (since they get damaged if you discharge them past that)?
Also I'm not sure whether to include the charging circuitry since people might start using different cells with different charging currents and max voltages. Do 18650s have some charging pattern that works for all of them without risk of degradation or explosion?