Indicator Lights: Red for charging, green for fully charged. INPUT:100-120V 50-60Hz,OUTPUT:12VDC 1000mA Please check whether the wires connected to the positive and negative terminals of the battery have come off, and whether the battery is working properly. Please note: A. Check the compatibility of the charging port. B. The input voltage is 100 - 120V; ensure proper insertion. C. Avoid overcharging and remove the charger when the light turns green. Small Blue Plug 12V Battery Charger for Kid Trax Ride On Car