The STANLEY BC200BF  gives you convenient, automatic charging for your 12-Volt AGM, GEL, or WET batteries. This handy unit rolls where you need it and has a telescoping handle for ease of portability. It functions as a battery charger and maintainer. 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.  Battery Reconditioner electric pulse technology can help reverse sulfate build-up on battery plates to improve charge capacity and extend battery life. Easy to read LCD screen. New.