What is regenerative braking on an eBike?

Regenerative braking captures energy when slowing down and returns it to the battery — like hybrid cars. It's mostly found on direct-drive hub motor eBikes (which can run as generators). In practice, regenerative braking adds only 5-10% back to range in typical riding. Most eBike enthusiasts consider it a minor feature rather than a significant range extender; motor and battery quality matter far more.