An E-MTB is still a mountain bike. Your gears, drivetrain, and brakes will all work fine if you’re unlucky enough to run the battery dead. If you run out of juice, you’re simply left with a bike that’s heavier than normal—a bit more than the weight of a downhill rig. Chances are you’ll be pushing up a few hills and you’ll end up with some good stories… and it’s unlikely you’ll let it happen twice.