1. Over-voltage Error LED

Illuminates solid Red; Battery Voltage is above Protect voltage.
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2. Bad Battery Error LED

Illuminates solid Red when connected battery will not hold a charge.
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3. Reverse Polarity Error LED

Illuminates solid Red when reverse polarity is detected.
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4. Hot/Cold LED

Illuminates solid Red when internal temperature is too high. Flashes Red (Along with 2. 3. 4. Error LEDs) when internal temperature is too low.
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5. Charge LED

Indicates the connected battery(s) state-of-charge.
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6. 6V Mode LED [Press and Hold]

Mode button must be pressed and held for 3 seconds to enter the 6V mode.
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7. Mode LEDs

Indicates the Charge Mode the charger is currently in. Push the MODE button to cycle through charge Modes.
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8. Mode Button

Push to cycle through charging Modes.
How to Change Modes.
How to use Force Mode.

9. Standby LED

Illuminates when the charger is in Standby Mode, the charger is not charging or providing any power to the battery.
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