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.

Start there. Don’t overuse the batteries, and keep them in a safe area, away from harsh conditions. Lower charge voltages are good for extended life. 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: The re-charging time of such battery may be longer than usual as the battery may have continued to discharge in spite of low power. The charger communicates with the individual cell in battery with a built in CPU and then it controls current, voltage, and temperature for both rapid and optimum charge

Place for storing the unit is also something you should consider carefully. As you know, optimal temperature is paramount in keeping the battery safe. If you live in an area that has extreme weather conditions, make sure that your storage place is in a normal condition.

Also, Lithium ion suffers from stress if its exposed to too much heat. You should avoid keeping the cell at a charge voltage high voltage. Avoid stressing the lithium ion. Lithium-Ion battery is surely a popular choice, becoming more and more popular every year. It is used in many ways today, with the huge scope of advancements for the future. Makita DC18SD is a charger designed to ensure the longevity and safety of the batteries. The advanced digital features of the charger make sure that the risks are contained while charging the batteries to the optimal level. Batteries differ according to their Charging speed, loading, depth of discharge and exposure to adverse temperature. Makita DC18SD is best suited for 14.4V- 18V LXT Batteries.The charging technology that is at work here, controls the current, voltage and temperature to maximize the battery life. Makita DC18SD 240V Lithium Ion 14.4V-18V Charges has a CPU that works by communicating to the battery’s built in memory chip during the charge cycle. What it does with that data is, it analysis that to determine the best course of charging at that point if time. Smart charging comes in handy when you consider the many factors that affect the life of your battery. This results in a better life for your unit. Makita DC18SD is your smart choice.

If it doesn’t work leave it a few minutes and try inserting it again. If it still doesn’t work leave the battery for a few days to completely discharge, then try it putting it on charge again. Flashing Yellow light on Makita Charger DC18RCOnce 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) If the Yellow light does not flash, it could indicate that it is “ conditionally charging” the battery. The battery can be charged in spite of the yellow warning light. But the charging time will be longer than usual in this case. The DC18RC fast charger, also known as the Makita DC18RC Li-ion 7.2 / 14.4 / 18v LXT Charger, uses Intelligent Charging Technology to control current, voltage and temperature to maximize the battery life. The DC18RC can charges a BL1830B 18v LXT 3.0Ah battery in approximately 22 minutes - and to the fullest charge. 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. Makita DC18SD has Makita forced air cooling fan technology and it helps keep your unit in its top shape. Makita forced air cooling fan technology cools the battery during charging by forcing cool air through the built-in air vents, and hence helps in prolonging the life of your unit.