Battery Tender Plus 1.25 AMP 12V ChargerDescription: Developed to maintain batteries in vehicles not in constant use and stored over lengthy periods of time Features: Automatically switches after fully charging to storage charge; constantly monitors the battery without the damaging effects of trickle charging After a full charge is reached, the Battery Tender automatically converts to a float charger and monitors the battery at 13. 6 volts Improved circuit design provides better absorption