1. Error LED

Reverse polarity. Reverse the battery connections. Or battery voltage is too low for charger to detect.
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2. Hot LED

Charger is outside of its safe operating temperature and is not charging. Allow charger to cool down.
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3. Standby LED

Illuminates when the charger is in Standby Mode. The charger is connected to AC power but no battery is detected, and the charger is not charging. Energy Save is activated during this mode, Standby drawing microscopic power from the electrical outlet.

4. Charge LED

This Charge LED indicates the connected battery(s) state-of-charge (SOC).
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