That doesn't make sense to me. Sure, maybe you can't get an OEM battery, but I've owned cell phones in the last 5 years that I easily swapped out the old battery with an aftermarket battery for about $12. I think people have the ability to buy batteries.
> With cellphones people that want a swappable battery can just get an external battery pack but most people can simply recharge daily.
My OG Pixel phone is on its last legs in terms of battery capacity, which means it will probably get scrapped(even if I trade it in somehow or get it "recycled"). I would have swapped the battery with a new one, but I don't have that option. At least without risking damaging the phone on disassembly. Recharging daily isn't a solution because it runs out of power in about 5 hours without even using it.
From reviews that product is likely terrible, but I know people that are happy with their iPhone battery cases.
I think that gets you about 10 miles in a Tesla. If it got you 20 miles it might be worth building a few slots into the trunk for extended range.