

Never heard the “above 80%” thing. I’m pretty sure you’re wrong about this. With lead-acid batteries, this was optimal. I’m pretty confident that lithium ion batteries it’s best to keep the charge as high as possible. Ideally you’d only ever use it fully charged. It’s health is harmed by draining it low/fully.
I don’t own an EV, but I know enough about it that I’m pretty sure this is the case. You should look it up for your vehicle though. This advice also applies to phones and other lithium ion batteries too. Lead-acid was damaged by keeping the charge high, but lithium ion is damaged when low, and almost all devices are lithium ion now.








Also, with breaking recovering energy, this negates some of the issues too. The inertia is used to recharge the batteries, so the losses are from friction and heat losses. Obviously lighter is better, but a lot of the issues of weight on efficiency can be reduced. Weight is bad for safety though, so there is that to consider.