The pcb inside the battery has a microcontroller that monitor the charges and charge cycle. When the cell falls below a certain voltage, it will instruct the charger not to charge and will show with a red-green flashing light. If the battery has been tried 3 times in succession then the pcb will brick itself from the makita charger. So first replace the bad cells. There are 2 solutions at this moment: charge with a 3rd party lithium charger like the imax b6 or replace the pcb with a working one. check out my blog on http://mkbl1830.blogspot.com/
Slightly off topic but if your old PA 18 charger flashes red when attempting to charge a NiMh battery it could be a pattern battery where the windows for the temp sensor contacts aren't accurate so they don't make contact and need a quick file.
Also if you're making one good battery from the cells from 2.Which is what happened to me,i.e. Old Makita battery top contacts, pattern plastic top cover
The first instance this occurs, you should repeat test substituting "known" good working battery! Problem is, it only takes one defective battery to take out charger PCB startup circuit. Down side if the charger is faulty they typically default to informing you the board is dead. Typically mosfet, switching ic faults. If no indicators illuminate with applied AC input signal, fault is typically fuse, inductor "AC" input side but can be confirmed simply verifying bridge rectifier operation ac/dc and diodes.
Same here I have 2 new batteries and one older version they're all reading red and green flashing lights guessing the Chargers the problem
SOURCE: makita dc1804f charger will not charge new i-mh 1834 18v battery
I think your tryiong to charge NIMH batteries oon a charger designed for Lithium Ion batteries. With all the new style batteries such as NICAD, NIMH and LI-ION, charging becomes difficult. Most chargers pre NIMH and LI-ion, were designed for NICAD's. The best advise, match your batteries with the correct charger
SOURCE: MAKITA LXT BATTERY CHARGER
hey
flashing orange=cooling abnormality.
you need to wait for the battery to cool.
see my mod page, it has all light explanations in it.
Have fun
Avi
SOURCE: dc1804f charger
If you have tried discharging the batteries prior to charging them already with no result and from what you describe in your post, then I would have to say the charger has issues. Go to HD or Lowes (not sure if Lowes carry Makita) but another charger and test your battery again. If you get the same fault, there is an issue other than the charger, if not you need a new charger anyway. If you get the same fault with the new charger, you can always return the new one. Short of opening up the charger and using a volt meter, this is the easiest way to test to pinpoint the real problem. I hope this helps and good luck!
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