Droo,
It depends on the particular bike, and how you will ride it, and I don't know those details.
But I use 15 or 16 Whr per mile for a round trip that includes a long hill. I'm probably on the high side as I'm using the motor power all the time. I suspect the norm on here may be more like 10 to 12 Whr per mile - perhaps others can contribute.
Wouldn't like to see you buy more expensive battery than you need.
Nick
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