Wont charge
One thing I have found with the ryobi 18V batteries in particular, and cordless tool batteries in general, is that if the battery is completely dead, the charger simply will not recognize it. This is referred to as a "threshold level" by some manufacturers. One solution that has worked well for me in the past is to take a battery that is known to be good and has a charge and use small jumpers to hook it to the problem battery, terminal for terminal, for about 1 to 1 1/2 minutes, much like jumpstarting a car. Then place the problem battery back in the charger and more often then not, it will take a full charge. Wear safety glasses any time you're messing around with batteries, because although the risk of explosion is minimal, it is still a risk.
How old are the batteries?
Jumpstarting them is only a temporary solution and really doesn't seem to last more than a couple recharge cycles. If the batteries are more than 4 or 5 years old it would be best to grab some new ones. Might be worth even checking if the new Ryobi Lithium Ion batteries fit your 18v tool... There is a good chance they will as they are likely the same battery shape/design and they would be a good option for new batteries.
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