Automatic lock button after 10 seconds to prevent misoperation. LifePO4, Lead acid (AGM/GEL/EFB, MF, Flooded battery, VRLA, SLA, wet battery. (normal - Max:13.2V-14.6V / 26.5V-29.2V). LiFePO4/ lead acid (AGM,GEL,EFB, MF, Flooded, VRLA, SLA and wet battery. ).