Hi John. Sounds like a good application for Li. Energy densities max out
around 95 WH per pound. Lead acid is up to 20 WH per pound.
Li batteries are about 3.3 volts per cell, so the pack your client is
looking at may be 4 or 5 cells in series.
It is probably important to buy a commercial pack,
Here is a far out idea. Why not try to work with Li-ion from a battery tool.
Such as a Ryobi LI-Ion battery, 18 volts, I would guess from performance they
start new at 5 AH and 18 volts. The step down can come from AM or Solar
Converters or one of the other step down converter people.
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