What a fantastic charger! Its quite powerful and simple to use. You can connect this, turn it on and it will start charging immediately. After that you can leave it connected forever to your battery with no danger of overcharging. This will not burn your battery. It's sophisticated charging computer constantly monitors the battery and will charge just as much as needed to maintain your battery at full charge. Take a look at the features below and you'll see this is much more than a simple battery maintainer, its a smart charger! Intelligent chargers follow battery impedance to end of charge cycle for all battery types. Fully automatic. World-Wide Universal AC Input 90 - 260 volts, 50/60Hz. Charge control: modified constant current charge to a constant finishing voltage then to a float standby. Current limiting. Fully automatic 3 stage charger can be left on the battery indefinitely. For any type lead acid battery, including conventional,maintenance free, deep cycle, gelled-type, valve regulated batteries. Finishing voltage: 2.28 volts per cell float; 2.4 volts per cell finishing. Not intended for use as a DC power supply. Full load at 2.1 volts per cell continuous - 100% duty cycle. Short circuit proof. Battery clips included as shown in picture.