Infinite Sequential Monitoring (ISM) by Battery Tender, makes sure the charger is delivering the correct charge process at any given time. Utilizing advanced software to continually monitor the battery condition assures you are charging and maintaining your battery correctly, leading to longer life and more engine starts. "If it won't start you can't use it!"
This trickle charger works great! Charged both of my lawn tractors as soon as the unit came in . Will also use this unit to keep my third vehicle charged when it is going to sit unused for a while.