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.
Testimonial: "thank you verry helpfull"
I found that there is a thermister in the battery.
Then placed my battery on a radiator for while, then
it charged. Batteries had been in a cold garage.
I have( 4) 3 amp 18 volt lithium ion batteries for makita tools that will not charge. the charger flashes red and green at me, at 100 $ a piece , i might as well throw the battery saw, impact and cordless in the F' in trash can!! oh and its been just over a year since i bought them
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