Please check if the RED LED light is flashing or not. If yes, this battery may defective.
If defective, try to repeat the conditions a second time by removing and reinstalling the battery pack. If the LED status repeats a second time, try charging a different battery.
If a different battery charger normally, dispose of the defective pack.
If a different battery also indicates "Defective", the charger may be defective.
SOURCE: Ryobi Model 1412001, 16vdc, 2A
I've open the charger and found that Q4 is open. But they have removed the part number from the component so you can't get a replacement.
SOURCE: 18 volt ryobi battery charger...green & yellow lights come on wha
talked to Ryobi and they are vague. It can either mean that the battery is bad, or the charger is bad and another one that maybe the contacts of the battery are dirty or not seating fully in charger. What I would look for in this instance first unplug the charger and look into charging slot to make sure the terminals of the charger are not bent and they come out into the cavity where battery would go. If not gently pull terminal into opening and retry. Sorry I couldn't be of more assistance
SOURCE: The Yellow and Green light both come on and stay
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.
SOURCE: Green & Yellow light on 14.4V charger
It sounds like your battery is bad.
If both yellow and green LEDs come on, this indicates
a deeply discharged or defective battery pack.
Allow the battery pack to remain in the charger for 15
to 30 minutes. When the battery pack reaches normal
voltage range, the red LED should come on. If the
red LED does not come on after 30 minutes, this may
indicate a defective battery pack and should be
replaced.
n After normal usage, a minimum of 1 hour of charging time
is required to fully recharge battery pack.
SOURCE: Ryobi Two 18V Lithium-Ion Batteries + Lithium-Ion
You are the thrid person in the last couple of days with this same problem and i check who was posting the problems all differant people all RYOBI 18V lithium-ion batterys and they all got them for christmas. SOMETHING is not right there is now warranty on the batterys but there is one on faulty workmenship there must be a problem with this type of battery good luck
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