Overcurrent protection, overvoltage protection, overheat protection, reverse protection, Float-mode monitoring automatically maintains optimum battery charge, The battery voltage is still under 5V (for a 6V battery ) or 10V (for a 12V battery) The error code F01 will be displayed, The battery could be bad. Have it checked or replaced.
return or refund for any product quality issue. 100% satisfaction service and technical assistance will be provided by contacting our professional customer service team. If you encounter problems during use, you can provide the status picture of the charger when charging and contact the seller for guidance.