You are probably skeptical that maybe the directions telling you not to do that are just intended to get you to buy more stuff. We've all been there. However, Li-ion batteries are very different from nicads. Used incorrectly they can be downright dangerous. So, no, don't try using the nicad charger for the Li-Ion batteries.
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: Recently bought Craftsman Lithium battery & charger that failed.
Sounds like your charger is only for NiCad batteries. With most brands, the new Lithium chargers will also charge the old NiCads, but the old NiCad chargers will not charge the new Lithium batteries. You will be very happy with the lithiums once you are able to fix the problem. As for Craftsman, buy Craftsman hand tools such as wrenches and sockets but I'd look elsewhere for battery powered tools.
SOURCE: Will the ryobi nicad charger also charge the
No, but the Lithium charger will charge the NiCads.
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