A solid green light means the battery is fully charged. Solid Green Light Means Battery is 100% Charged Warning Lights

A single Flashing green light means that the charger is in standby mode. It is connected to an AC power supply and is ready to start chargingyour batteries. Once the battery is over 80%charged the solid redlight will be accompanied by a solid greenlight. Solid Red and Green light on Makita Charger (DC18RC)A flashing yellow light indicates a cooling abnormality. A yellow light will start to flash if the Cooling systemhas come into operation. The battery will still charge in spite of the warning light, but it may take longer than usual.

Inserted battery has Over-discharged, this can happen if the power tool has not detected that the battery is low and continued to drain power from it. Built-in fan circulates air through the battery during the charging process to cool the battery for faster charge time Congratulations! if you have a solid redand solid greenlight next to each other it means that your battery is over 80%charged. If you are desperate for your battery you can take it off charge now and get your job done. Or you can leave it till you get a solid green light signaling the battery is 100% fully charged. Important note: There is no power ON button on the Makita chargeritself, you just have to plug it into a 240v power outlet and the green light should come on and start flashing. The most common reasons are:

Technical info

The fuse may have blownin the battery charger plug – If this is the case just replace its fuse with a new 13amp fuse. The solid green light will appear on its own when the battery has finished charging.The charging light will change from solid redto solid greenand the melody soundor buzzer sound (a long beep) will come out to notify completion of charge. This is how the charger looks when plugged in but with no battery in it. The green light will flash continuously, this just means the charger is plugged in but there is no battery inserted in it. A (dusty) Makita battery charger Solid Red Light The Makita DC18RD/1 110v twin 18v Li-ion charger, charges 2 batteries simultaneously. The rapid charge technology selects the optimum voltage and current and temperature is controlled by the forced air system that circulates air through the battery to prevent overheating. and a full charge sound alert confirms when the charge cycle is complete.