4 ms·Regen braking doesn’t use waste heat. It converts mechanical energy back to electrical.by sanj 7y agoRegen braking doesn’t use waste heat. It converts mechanical energy back to electrical.js2 7y agoAnd in so doing, reduces waste heat due to friction, which is likely what the parent commenter meant.agumonkey 7y agoSome say it doubles the lifespan of brake pads.