Try this...
Don't throw away your old batteries yet. If you have one good battery. Jumper it with a bad battery. Hook it up + to + and - to -. Find out which terminals on you battery are the + and -. Some batteries have 4 terminals for other charging functions.
Only jumper it for 1 or two seconds. Maybe do it twice, then put the bad battery back on the charger and see it it charges up. It worked on my B&D 18v Ni Cad (outside terminals), and it worked on my Dewalt 24v Li Ion (B- to B- and B+ to B+...outer terminals). DO NOT leave Ni Cad on charger continuously. The continuous heat shortens the battery life. Don't leave Ni Cad empty for a long period. Don't leave Lit Ion fully charged for long periods of time. Charge them, then run it on a tool for 15-30 seconds before storing it long term. The jumping of the batteries may break the Battery Memory of the NiCad. Other way is to give it a quick temporary Amperage boost to break the memory issue. the trick is finding a charger that does that. Maybe a car charger, but voltage is not the same, Lit Ion does not have memory. CAREFUL. Too much amperage can blow a battery up so do it for really quick pop at a time. 1 to 3 sec at a time.
If the battery has been used a lot or has not been kept charged up it likely is shot. A battery that is not used a lot should be kept charged. I keep my battery operated drill on the charger almost all the time. I have two and change them once every two weeks. Several years old and they both work good.
SOURCE: ryobi 18 volt batteries wont hold a charge
Ryobi batteries are specific to each Ryobi model, so please write down which model number or the original battery part number you have. How old are the batteries?
I had the same problem with many bateries I had at home, like cell-phone batteries and also some power tool bateries. Did not have any Ryobi power tools tho, so don't hold me acountable if this doesn't apply to your hardware:)
Many batteries have the "memory effect" which means that if the battery was not completely empty when it was set to recharge it might now only recharge to the level it was emptied to, so for instance if you used the power tool for 10 mins and the battery emptied to, lets say, 90% capacity, it might occure that the next time you recharge the battery it will only charge to it's 90% maximum...doing that many times lowers the maximum recharge capacity. As I heard the new Li-Ion batteries do not have this problem.
I hope this makes some sence as my english is not that good and it was a bit hard explaining my thoughts:)
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