No, not for the tesla.
Do these work? They have a long tail of 1's in amazon reviews saying they are total shit.
Another concern is whether they can overcharge the battery. I'm thinking of this one because
a) It has a micro controller to avoid overcharging
b) Battery Tender should know WTF they're doing?
https://www.amazon.com/Battery-Tende.../dp/B004Q86JJ8
No idea whether 5W vs 10W...