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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
If both lights are blinking on the charger after putting the battery on to charge, the battery is no longer chargeable. Most likely it's bad cells inside the battery, the charger is reading the battery as bad and will not charge it. The only fix is to buy a new battery.
there is a problem with the charger and given the age I would take it to an authorized dealer and get a replacement. If you give me your general area I will try and locate one close to you. Please before voting if you need more assistance let me know. Thank you
If you put a battery on your charger and both red and green lights flash it is indicating that battery is defective. There may be a short in the battery or they just may be too old and worn out to charge anymore. If the charger is reading the battery as defective it will not charge the battery. The only fix is to buy new batteries.
If both lights are flashing it means the battery is defective so it won't charge it. By defective it could mean the battery is just worn out or there may be a short in the battery. If the battery is under warranty you can get it replaced at a Makita Service Center, if not you have to buy a new battery.
unplug charger to let it reset. plug back in and then try again, if it still flashes red/green that would indicate a battery failure. check for warranty replacement.
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