[maaark]

>It also has a "battery drain mode." Basically, when you are ending your journey, you will tell the Regera where you will be parking the car, at home or a charging station. The Regera will then make sure that the battery is fully drained before it gets to the end point, which means it'll be ready to accept a charge. Very smart. It has a fully electric mode of about 22 miles.

I thought this was the worst thing you could do to lithium cells?!

[pjc50]

"Fully drained" for the system probably doesn't mean "fully drained" at the cell level, since (as you say) there is a point below which draining cells damages them. The reported "0%" line will be some way above that.

[maaark]

On second thoughts, I'm guessing that what this ACTUALLY does is make sure that the petrol engine doesn't waste fuel recharging the battery unnecessarily at the end of the trip when it's going to get plugged in.