The winner I believe was typical human size. From a cnbc article, "fitted with legs 90 to 95 cm (35 to 37 inches) long to mimic elite human " and the legs were proportional to the body, so person sized. And based on the read of the cnbc, I don't think needed a recharge. They imply in the article it beat the humans running the same race, so unless it was fast enough that the charge time was so small as to not change who "won", I don't think needed a charge. Could also be why it was a 1/2 marathon instead of a full. Maybe it would have needed a fillup for a full 26 mi marathon.
Agree, quite a feat. The article I read also says,
"Experts said the skills on display during the half-marathon, while entertaining, do not translate to the widespread commercialization of humanoid robots in industrial settings, where manual dexterity, real-world perception and capabilities beyond small-scale, repetitive tasks are crucial." which I think is crucial.
Still a ways from Millie from the Jetsons handling household chores from cooking to washing dishes/clothes to vacuuming.