⚠
warning Battery
Error Code RED LIGHT FLASHING
Indicates the charger has AC power but may have low battery voltage or incorrect wiring to battery terminals, especially if it continues.
? What Causes This
Low battery voltage (less than 3 volts), improper DC output connection.
✓ How to Fix It
- Verify battery connections are correct and secure.
- Check battery condition and voltage level.
Source: page 6 of the official manual
From the manual
This error code appears in:
Battery Tender Junior