I've had one for years on my Harley FatBoy. I got 7 years out of the HD battery cus this thing is always on the bike when the bike is parked in the garage, a fantastic product, low cost top quality. It keeps the battery in perfect shape, always. It does everything claimed by the mfg. I have even used it in an emergency once for my car battery, where I left something on inside the car all week without realizing, battery was dead, rather then jump and possible cause a problem in the newer cars with damaging all the electronics in the car I put the Deltran on for a couple of hours and it brought the battery back to life to start the car. This tiny thing charged up an Audi A6 battery which is enormous, and it paid for itelf over time by keeping my HD batttery good for 7 years!!! And bike batterys sit around unused a lot more than a car does. Fantastic product, it is teh best out there too, other brand chargers have issues, these don't. Perfect