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Electrochemical Cells, as they sound, produce electricity from chemicals within the cell.
- BatteryCells - specifications of various batteries available
- BatteryPacks - how to combine batteries into larger meta-batteries
- RePackaging - about repackaging existing cells into a different form-factor
Fuel Cells produces electricity from a chemical source - typically hydrogen, natural gas, propane, methanol or ethanol. The cell dissociates a proton (H+) and passes it through the cell from one membrane to the other. Instead of passing through the cell, electron are used for current flow in the electrical device.
(so you'd have to put two in series and balance
them as per the app note to buffer any 5V supply current surges. Probably useful for buffering start-up current draw from mechanical drives like the microdrives.)
-- RickJones - 31 Jan 2002
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