That's a tough one. The Merc B-class electric is a great car -- but the 100 mi range, with no DC fast charging makes it limited appeal.
My family currently owns 5 EVs (big family):
- '14 Merc B-Class,
- '14 BWM i3,
- '14 Fiat 500e,
- '15 Tesla S 70
- '18 Tesla Model 3 RWD Long range
We love all our EVs, but the longer range makes such a difference. My wife drives the Merc and loves it, but her commute increased to 100 miles/day. She charges on 120v outlet at work (only thing available) but in the winter even that can sometimes make the return trip hard. I know it stresses her out.
Now that a new Tesla Model 3 with mid-range battery is about $35K-$38K after tax incentives, it's hard to find people wanting 100 mile range low mileage used cars. Need to find someone who's got a short commute and loves Mercs. Good car though. Good luck!