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Really, what is your goal? Are you just wanting to avoid hard pedaling going up hills? If so, why don't you just build a bike like this (see attachment)? I built this for less than $600. It has lithium batteries and it elimates the need to pedal at all (if you don't want to).
If you're interested, here's the specs:
Batt pack: 16 Headway 40152S cells (24V/30ah)
Top speed: 25mph (flat surface)
All electric range: 20-25 miles (terrain dependent)
The mid mount motor allows me to still shift gears so I can use the motor's pwr in the most efficient manner for the terrain.
You're project sounds very ambitious to me but, I don't want to be a stumbling block. Anything is possible if you have the money and the time. I would hate to see you do it with SLA's. They are just too heavy and bulky (not to mention their service life).
If you need more info, let me know.
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