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I saw an E-bike that ran off a couple of DeWalt Lion batteries - that was pretty cool too!
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Might have been my bike. Built it as soon as I was able to get hold of the batteries at a reasonable price a year and a half ago. As far as I know, it was the first seventy two volt Dewalt setup in the country. That has been long surpassed now and some of my ebike friends are building their own BMS's and chargers for the A123 cells that are used in the Dewalt chargers.
All right. Can't figure out how to load images here. I think I have it as an attachment though.
As for MetroMPG's formula it helps to remember that we can cancel labels when we do the math.
For example: 1 mile/20Whr x 1000Whr/3412 BTU x 114500 BTU/1 Gallon
These are all conversion factors except for the first term which is an actual measurement from one of my own rides. You can see that the Whr terms and the BTU terms will cancel when multiplied out and all that is left is numerical values and miles/gallon. From there it's just a simple matter of punching the numbers into a calculator.
JJ