Charger Flashing Red? Troubleshooter
Red flashing means different things on different chargers. Here is how to narrow it down.
Check the charger manual for what its lights mean. They differ between brands. Work through one question at a time. You can go back or start over whenever you like.
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Safety: this troubleshooter is general information. Follow your battery and tool maker's instructions. Don't open a pack or a mains-powered charger, bypass a protection board or force-charge a rejected pack.
