I have a friend who builds and rides “personal mobility” vehicles, like electric skateboards, scooters, etc. He lives up on a hill in SF and says that for his vehicles with regenerative brakes he doesn’t charge them beyond 90%. He says that they’re too small to meaningfully add the power “wasting” circuitry, so leaving the house and going downhill at the beginning of a journey would exceed 100% charge.

Anyways, it’s totally possible that they’re using some power wasting technique, but they could also start the day uncharged.