Makita battery charger wont charge

It sounds like there may be an issue with the charging circuitry on your Makita DC18RC charger. Unfortunately, without a schematic, it can be difficult to diagnose the problem. However, here are a few things you could try: Clean the battery contacts: Sometimes, a buildup of dirt or debris on the battery contacts can prevent the charger from properly detecting the battery. Try cleaning the contacts on both the battery and the charger with a clean, dry cloth. Check the power source: Make sure the charger is plugged into a working outlet and that there are no issues with the power source. Check the thermal sensor: The Makita DC18RC charger is equipped with a thermal sensor that prevents the battery from charging if it gets too hot. If the battery is too hot, let it cool down before trying to charge it again. Try a different charging mode: The Makita DC18RC charger has two charging modes - rapid and maintenance. Try switching to the other mode and see if that makes a difference. Check for loose connections: Inspect the charger and battery for any loose connections or damaged wires. If you find any, try repairing or replacing them. If none of these steps resolve the issue, you may need to take the charger to a professional repair shop or contact Makita customer service for further assistance.

I agree that the pictographs are not very helpful. You probably have one of the new chargers. I have an old one, which is a little easier to figure out.

From top to bottom

1. The flashing green light with the electric plug indicates that the unit is plugged in and ready to go.
2. The flashing red little fan means that the battery is too warm so it is just cooling it and not charging it at that moment.
3. The solid red empty battery outline means that it is charging but hasn't got very far, less than 80% full.
4. The mostly full battery outline with both solid red and green lights at the same time means it is 80% full or more
5. The full battery outline and solid green with the musical notes means it is full up.
6. The broken battery outline with flashing red and green means you've got a broken battery.
7. The yellow light with the wrench means the charger is "conditioning" the battery, whatever that means.
8. The yellow light with the fan means "cooling abnormality."

Hope this helps

Makita chargers are designed to check a battery before charging them. If both the red and green lights are flashing after you put a battery on the charger, it is reading a problem with the battery and will not charge it. It could be a bad cell, a problem with the circuit board, etc. but as long as it reads the problem it will not charge the battery.

Alternate Red and Green flashing means bad battery. Buy a new one, or take it to a Makita Service center for replacement if it's under warranty.

Normally the yellow light indicates hot battery, but it could also mean dirty battery contacts so the heat sensor can't be read, or that the fan is clogged with dust and unable to cool the battery. The manual says let the battery cool and try again. If the yellow still flashes, it's contacts or the fan.

Read the manual online at:
http://www.makita.ca/data/upload/accessorypbim/417_im_english.pdf

Don,t worry about lights,just check if the batteries get charge.If not your charger is fry.Is time to buy a new one.

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This isn't true because I have a second charger and it works fine

If the charge count on the batteries is under 300, Makita will replace them. Makita has a known defect in this battery that causes the battery to shut down before it is dead. So as of now they are exchanging ones with low use.

If they are truly defective and makita won't replace, you have to open them, find the dead cell or blown fuse, and replace. Search youtube makita battery for a video on repairing this battery. But once the red and green lights on the charger flash, the the battery can't be charged on a Makita charger -- it's been locked. So use a third party charger.

Yep, not the batteries, mine is doing the same thing but my second charger works fine with the same batteries

• When the battery cartridge is inserted, the charging light color will change from green to red and charging will begin.
The charging light will remain lit steadily during charging.
• One red charging light indicates charged condition in 0 – 80% and two red ones indicates 80 – 100%.
• With finish of charge, the charging lights will change from two red ones to two green ones.
• The charging time is as follows:
Battery B9017A, BH1220, BH1420, BH9020A: approx. 20 minutes.
Battery B2417, BH1233, BH1433, BH2420, BH9033A: approx. 30 minutes.
Battery B2430, BH2433: approx. 60 minutes.