I used a battery tender on my race car for years when its home in the trailer but last year the green light was on indicating good when in fact the battery was bad and had to be replaced . I don't use the tender much anymore maybe on my winch battery once in awhile.
68 Dart 410 / 904 92 D150 original owner 21 Ram 1500 Quad Cab, Big Horn , Hemi ,4x4 23 Audi Q5 16 Honda HRV