Keep your battery Charged with this highly reliable, Guest 1.5 amp maintainer. Extends battery life using precise voltage output and will Charge, monitor and re-charge your battery if the voltage drops below 12.9V. The maintainer can be safely connected to the battery for short or long periods of time. To increase versatility the maintainer comes with Alligator clips and ring Terminals for the output cable. This maintainer will Charge smaller batteries and maintain batteries up to 125Ah (group 31).