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
This happens on some of my batteries. On at least two of mine I got busy and left then in the charger (forgot them) and the light switched to red and the battery charged. So far I don't have a good solution to what is going on. That is why I was looking at the inet.
The same thing happend to my charger, i bought na new battrey, and now it charges normal again
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I have 2 batteries and one charges, so I'll rule out the bad charger. I'll try cleaning the contacts (unplugging first) and see if it goes red. If not, it'll go back to be responsibly disposed of.
The light on my 4volt charger won't come or charge my ryobi screw driver
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