I have the thundersky batteries. A guy on here with the Thundersky's said he was getting 3 miles per 1AH I think which means he probably could go 45 miles or more probably on a 20AH pack. I think that's what he said. I know he did a 30 mile run pretty easily. It depends on what kind of motor and controller you have. If I hit full throttle on mine, I get only about 1.6 miles per 1 AH. If I go half throttle, I can get 2 miles per 1AH and I have a very powerful setup that draws a lot of current so yeah, the 3 mile per 1AH is probably accurate with an average motor that isn't too energy consuming. So if you use 75 % of the battery (15 AH), then you could get 45 miles on one of those nine continent motors with a 20 amp controller. Going at probably 15 - 20 mph the whole way. Once you take it up to 30 mph, you get a lot worse range because of the wind.

if you used the entire battery or close to it without harming it, you could probably go 19AH x 3 = 57 miles as long as there weren't a lot of hills. Hills will also drain the battery more.

The most I've done on my 36v20AH thundersky was a 19 mile run but I only used 50 % of the battery to do it.