When you say "range from a charge' it is very difficult to say. I have run 360w Cyclone kits and EZip 450w bikes with the Thunder Sky packs. I think it is better to talk about miles per ah rather then total range per charge because we all have our opinion what is a charge. Some max their charge and get a little more from the top charge then others. And some people will run their packs to 80, 90 even 95 of capasity. Personally I currently only charge my packs (2 24v 20ah TS) to about 28.4v so they are not at max charge when I start my rides. I am betting there are a lot of us doing the exact same thing because we are not using a "true" BMS to maximize each cells charge. the same goes for the discharge. I had a CA meter on my Cyclone so I knew my ah discharge but I don't have that on my EZip yet.

Bottom line both my son-in-law and I run between 2 to 3 miles (.33 to .5 ah per mile) per AH used. This will very depending on hills, speed and amount of peddling. I have very bad knees (over due for replacement on both) so I tend to limit my rides to 20 to 25 miles and the last 5 miles I am generally on motor only vand the pack is still going strong. So as you can see it just depends on how you use them.