BikeMaster Lithium Ion Battery Charger / Maintainer If you have a Lithium battery, don't damage it by charging it with the wrong type of charger. This charger has been designed to keep your Lithium-Ion batteries fully charged. Features: Fully automatic with built-in circuit protection to keep from overcharging, short circuiting or reversing polarity Features easy-to-read LED lights that indicate when power is on, charge in process, reverse polarity and fully charged SAE quick disconnect with large alligator style clips and ring terminals for charger hook up High-quality, shock-resistant ABS construction Input: AC 120-Volts, 60Hz Output: DC 12-Volts, 2-Amps