Rivian's TM-B electric bike

808Wh battery and 100 miles of range. These two numbers track with each other and are roughly believable.

OTOH, with a battery this big, a generator powered by the pedals, and regen braking this thing has to be heavy. I'd expect it to weigh at least 80 lbs. More likely 100. The fact that their "specs" say nothing about weight suggests they're embarrassed about the weight.

My eBike is close to 90lbs, but it is a large cargo bike touted as a "small car replacement". It is close to a tandem bike in size with a steel frame. I'm so used to it now, but I live in a house and never need to carry it up stairs. It does mean that I need an expensive bike rack to support that weight.