The STANLEY® BC100BF gives you convenient, automatic charging for your 12-volt AGM, GEL, or WET batteries, plus LiFePO4 (Lithium Iron Phosphate Batteries). This handy unit functions as a battery charger, maintainer, and trickle charger. Its fully automatic high-frequency charging restores lost battery performance for stronger engine starts and extended battery life. The built-in circuit protection guards against overcharging and reverse polarity. The easy-to-read LCD screen lets you see operation and charging status..