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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
It sounds like you drained the batteries down as far as they will go. This happened to me and then I purchased the 18V Lithium-Ion battery and charger. I was able to re-charge the drained battery on the new charger. This may work for you as well. They cheapest solution for you is to just purchase a new battery.
I have found when I put a battery on to charge and the green and yellow light turn on the battery is low voltage and the charger will not charge the battery ( bad battery)
http://oneworld1.inetu.net/manuals/ryobi/hp1442m_1802m_874_eng.pdf
It sounds like your battery is bad. If yellow and green are on for more
than 15 minutes it probably a defective battery pack. See page 8 in the
manual.
More than likely a defective battery sinse the other ones charge fine..
Bring it back for exchange of another one..
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Solution is two fold. Will try the freeze and re charge approach today and do this a few times. The long term soluiton is to purchase two Lithium batteries and a duel chemical charger. Expensive solution but seems it will work.
Just was on a website for Ryobi drills and it states that if the yellow and green light stay on for more than 15 minutes the battery is fried. Couldn't find the link but if you do a search for Ryobi Drill 18 volt you should find the same info. It was as product review from Australia I think.
I also have a problem with the charging of Ryobi batterys. They seem to charge AOK with the green light coming on but the charge does not last at all. Not sure if the problem is with the batteries on the charger.
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