If you have a Lithium battery, don't damage it by charging it with the wrong type of charger. Manufactured with over 1 ft., of reach, the BikeMaster Lithium-Ion Battery Charger/Maintainer is fully automatic with built-in circuit protection to keep from overcharging, short-circuiting, or reversing polarity. Features easy to read LED lights and comes with a five-year manufacturer's warranty.