I had the same problem and found a solution on another forum...
Plug the battery into the charger. The yellow and green lights come on. Leave the battery plugged into the charger. Plug and unplug the charger power cord from it's power source a few times until the the red charger light comes on..... problem solved!
I think the "smart" circuit in the charger that is supposed to trickle charge before the regular charge cycle needs at least some battery power to test and start the cycle. If the battery is totally discharged, the test can't deternine the battery status and will not charge.... Plugging and unplugging the charger seems to bypass this teat and charge the battery normally. The charging process should work normally after this method.
Hell yes,thanks! I was about to trash my drill and saw!!
took about a dozen plug in's and almost gave up... then RED LIGHT! thanks! you just saved my drill from the trash heap!
Thank you. This worked! I was about to purchase new battery or charger. I found that keeping the plug close to the receptacle then quickly making contact then pulling the plug away quickly resulted in a red light status with three repetitions on the procedure.
Thanks for this solution. I plugged into a switched outlet and flicked the switch a couple of times and voila, battery is now charging.
Thanks also. I have had this drill for so long, I have forgotten the standard charge light configuration. I also don't use it everyday. Or month for that matter.
Anyway, after the light being amber for 12 hours (I presumed that it was just a trickle charge) I tried your technique. I had to rapidly pop the 110 connection in and out multiple times. But it is now red.
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1canfixit's solution worked like a charm. I have two batteries that were stuck around 4.5 VDC and wouldn't charge so my logic was that I needed a new charger. Thanks for sharing your solution as this saved me some real $$$. ...Tom
SOURCE: ryobi cordless drill
sounds very much like the batterys we used to have ryobi drills but the batterys dont last now we use makita/dewalt/bosch
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