Faster Multi Stage Charging. Fully automatic. 4 complete stages, for fast charge times, conditioning, maintenance of each battery and dockside power supply mode.User Programmable Battery Type Selector and Conditioning mode 1 to 4 hrs: For use with Lead Acid, AGM or GEL batteries. Model 1230i Plus has active battery balance control (BBC ) which actively monitors the condition of each battery or bank while charging, to ensure no battery is overcharged.Ignition protected, over temperature , over voltage and reverse polarity protection2 year warranty. Certified to Marine U.L. 1236. CE certified, IMCI.