They reportedly use heavier duty starters and batteries, and it this supposed to start up if the battery is getting drained. It doesn’t stop automatically under certain temps and maybe above certain temps, not sure on the latter. Whether they got the engineering right depends on the design and manufacturer.

I personally see it as a dead end for gas o ly vehicles because it requires too many assumptions to work automatically in all situations. It already works for hybrids, because it can just donits thing off of battery draw, it doesn’t care about vehicle speed.