SOURCE: Does it harm a Ryobi 18v lithium battery to leave on Charger?
Lithium-Ion batteries require careful charging and temperature monitoring while in the charger. Ryobi's Charging station monitors many functions and shuts off when the battery has gone through a complete charge. This is indicated by a steady Green light. Once the Charge indicator is a steady green the charger stops charging. With any battery It will slowly discharge and I don’t think the Ryobi will maintain a battery that is never removed. For example, if after a complete charge cycle if the battery was left there for 2 years and then you went to use it, it would likely be completely discharged. However if the battery charger is unplugged then plugged back in a new charge sequence would start. I lose power at my house about every 6 months or so. Once power is restored a new cycle would start and the charging cycle begins again.
Hope this helps and have a great day.
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SOURCE: My porter cable 19.2v model 8605 battery charger
Porter Cable has not offered a replacement for their poorly designed 19.2V chargers. I had the same problem and happen to like my drill and circular saw. I found a universal charger called a model number CHUN-2420. Google it--I got mine for $27 plus shipping. All you need to do to make this work is splice 3 wires.
My charger is a PC model 8624, so the instructions might vary slightly between the chargers. Remove the six screws on the bottom of your PC charger. Remove the bottom section. Remove the screw(s) that attach the circuit card to the plastic housing. Disconnect the 3 pin white charging connector from the circuit card, and cutoff the connector. Discard the circuit card and power cord. Cut the 3 conductor (red/yellow/black) cable coming out of the Chun-2420 approximately 2' from the charger. Splice these three wires to the three wires in the charger housing that connect to your battery. In my situation, Red/Red, Yellow/Yellow, White/Black. To verify, red=positive, black/white=negative, yellow=temperature sensor. Wrap the red/yellow/black cable with electrical tape where it exits the PC charger through the power cord hole. Re-attach the bottom.
SOURCE: porter cable 18 v lithium
How old is the battery and do you store it in the cold. Cold is no good for the batterys but if its flashing that its trying to change and the problem may be with the charger if there not more then 3or 4 years old and were not left in cold conditions and the lithium battery haven't been out for much longer then that. Ihave the same gun and for a year its worked vary well with the 7 inch saw and i use them a lot.
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
SOURCE: Makita 18v lithium battery when put on charge
This isn't true because I have a second charger and it works fine
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