I use the Triumph brand charger (made by Optimate). It works extremely well, cycles, tests, and keeps the battery in top condition. It also comes with the small plug used with the Triumph receptacle. Costs a little more but keeps my battery running strong. I also have a few Battery Tenders for lawn mower, dirt bike, and go-carts. Which also works well but they only trickle charge the battery. Research the Optimate and you will see the additional benefits it offers over a plain trickle charger.