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This LED guide applies to the above listed single-port chargers models. For 36V multi-port chargers, see: What do the flashing lights mean on RYOBI 36V Multi Chargers?

LED Indicator		Battery Pack	Red LED	Orange LED	Green LED	Action
	Power On	Without battery pack	On			Ready to charge battery pack
	Testing	Hot battery pack		On		When battery pack reaches cooled temperature, charger begins fast charge mode.
		Cold battery pack		On		When battery pack reaches warmed temperature, charger begins fast charge mode.
	Defective	Defective	Flashing		Flashing	Battery pack or charger could be defective.
	If the LED status shows defective, reset the charger or reinsert the battery. If the LED status repeats a second time, try charging a different battery. If a different battery charges normally, the previous battery is defective.  If a different battery also indicates "defective", the charger may be defective.
	Charging	Fast charging			Flashing	Charge in progress.
		Deeply discharged			Flashing	Charger pre-charges battery until normal voltage is reached, then begins fast charge mode.
	Ready	Charging complete			On	Fast charging is complete; charger maintains  charge mode.

If your battery isn't charging, see: Why isn't my RYOBI Battery charging?

If your battery is defective after troubleshooting, and is still within the warranty period, take it back to the retail store along with your receipt or proof of purchase for warranty assessment.