The modified e-bike can manage to run for about 3 hours on flat ground at a speed of 25 km/h, which equals about 75 kilometers.
The bicycle itself has good off-road capabilities. Modifying it with electric power makes it even better, whereas a combustion engine could easily strain the chain.
Finished batteries are too expensive, so I had to make my own. LiFePO4 is safe and won't blow you away.