Combined within the bike are a lithium-ion battery and a fuel cell, the latter of which is fuelled by a hydrogen gas cylinder. In the not-too-distant future, it is envisioned that riders could carry multiple reusable hydrogen cartridges with them as they ride, refilling that cylinder as needed. For the time being, though, hydrogen refilling stations are relatively few and far between.
Originally, the Alter Bike utilized a 200-bar (2,901-psi)-capacity gas cylinder, which reportedly delivered an electrically-assisted pedalling range of about 100 km (62 miles) per fill. Now, Pragma has swapped in a 300-bar (4,351-psi) carbon composite cylinder, increasing the range to a claimed 150 km (93 miles).
By contrast, the average battery-electric e-bike has a range of around 50 km (31 miles).