I had to replace my previous Battery Tender as I sold one of the cars that I used it on so I included that for the new owner..
It charges very slowly which is good for the battery as "rapid charging" seems to shorten battery lifeI have used it to re-charge almost totally dead batteries!
Like the attachments that can ad to the battery for plug and charge, from vehicle to vehicle.
Like the compact size and the long lead lets me charge a car parked right outside the garage without having to use an extension cord.
Great value for the $$$ and all my batter are always charged!!