Maintenance charger - recommendations?

[Doctor Gollum]

Battery chargers have come a long way. 

Mine is ancient, about the size of a shoe box in a steel casing and it quietly hums to itself when in use. 

And probably not suitable for using on a modern car, certainly not without disconnecting the battery from the car first.

No it's an old stylee battery charger. I've always disconnected the battery or removed it from the car for overnight charging in the garage. 

Helps keep.the house warm too