This is just in the "idea" stage right now
http://www.mbi.panasonic.co.jp/oemba...t/ioc0108e.htm
This link shows a button-cell-size rechargeable Lithium-ion battery, 130mAh, 3.7v. This one is 30mm in diameter and 3.2mm thick, which seems a little too big to fit in a bit. It might be mounted on top of the pcb. There is another batt (click "lineup/specification") farther down that is 24.5mm and 120mAh. In a pinch, you could get several smaller ones (with less capacity) and wire them for more run time.
1) Has anyone found any other rechargeable Li-ion batteries that would fit inside a bit?
2) These would have the same voltage as a 3-cell mod. I was thinking it'd be nice to have some resistors or something to cut down on the voltage. It'd be even better if it was adjustable, like a potentiometer wheel type setup. It would be really handy to have a dial on the back/top of your bit that could basically adjust the top speed of the bit by changing the voltage allowed from the battery to the motor. This would work with those dual-cell mods too, but it'd be even more useful with this 3.6v mod. That way you could "dial down" the speed for tracks with lots of turns, and turn it back up for oval-type tracks.
Comments or suggestions?
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