Battery Tender Plus, the smart way to keep your batteries just right long-term! The Battery Tender Plus keeps you from having a dead battery... or a boiled one! It's not a trickle charger, it's smarter than that.It constantly monitors the voltage level and keeps it right without overcharging and damaging. Periodic maintenance recommended, but can be connected for months, even years without problems.Comes with:Fully automatic 4-step charging... initialization, bulk charge, absorption mode and float / maintenanceFor all sealed AGM, lead calcium and flooded batteries After reaching peak full-charge voltage, it monitors voltage levelTemperature compensated for best performance Spark-proof and reverse polarity protected. State Model, as available in the Shopping Cart.!!! Limited Quantities !!!