i bought a battery tender on sale a 3 years ago to replace the 5 year old $5 harbor fright battery float charger
still haven't used it cuz the $5 harbor fright charger is still chugging along
due to my shaved handles/keyless entry module i need to plug my 58 truk in anytime i don't drive it for a week
this one has lasted 8 yrs, last one fried due to the battery failing
i keep one on my mower too. my son uses them on his bike and 68 elco. my neighbor just bought 5 for his boat
another neighbor has a car collection, he bought 10 of them 5 yrs ago
i highly recommend the harbor fright charger, regular price is $10, they go on sale all the time for $5
they're cheap and they work great
automatic-battery-float-charger