This XH-M601 12V Battery Charging Control Board is an intelligent, automatic power management module designed to protect 12V lead-acid, AGM, or gel batteries from overcharging and deep discharge. Utilizing an onboard SRD-12VDC-SL-C relay, it automatically switches the AC charger on when the battery voltage drops below a set threshold and safely cuts off power once full capacity is reached, significantly extending your battery’s lifespan.