I am trying to figure out expected miles on my pack

I have an electric scooter. It has 21 cells. 1st gen chevy volt so 45ah.

I rode it today, fully charged at 83v
I drove 32 miles and it had 71v
If my cutoff is 3v per cell, 63v, how many more miles can I expect to get until cutoff
Voltage depletion isnt linear correct? Thanks

TheSiege said:

I have an electric scooter. It has 21 cells. 1st gen chevy volt so 45ah.

I rode it today, fully charged at 83v
I drove 32 miles and it had 71v
If my cutoff is 3v per cell, 63v, how many more miles can I expect to get until cutoff
Voltage depletion isnt linear correct? Thanks

Click to expand...

Between 3.38V per cell and 3.0V per cell, there isn't very much energy.

Get a volt meter and just ride until the battery runs out.
Note your speed, any headwind, any hills you went up.
Do that a dozen or so times and you just get a feel for miles left on a battery pack.
Without a voltmeter you just have to figure out by feel of voltage sag, slow throttle response which is easier on an ebike then on a emotorcycle.

I do have a voltmeter, I just have never ran it to empty

71V / 21s = 3.38V/cell = around 5% SoC
32mi * 5% = 1.6mi more

https://www.diyelectriccar.com/threads/chevy-volt-soc-curve.168906/