NO! Never charge lithium batteries in a charger designed for nickle based batteries like the NiHi your old charger was meant for. Ryobi did design the new Lithium charger to be backwards compatible so you can charge your older 18V NiHi batteries in the Lithium 18V charger.
Also note, NEVER miss-match the voltage, for example, make sure you are not trying to charge 12V batteries in an 18V charger unless the manufacturer has specifically stated that the charger is capable of multiple voltages.
If your old Ryobi charger is a ONE and your new lithium batteries are One ...then you absolutely can charge your new batteries on your old Ryobi charger
What does the OP mean by a "regular" Ryobi charger? He may mean a green charger designed for Lithium batteries, but it sounds more like he is speaking of the blue-gold charger and Ni-Cd battery. Ni-Cd chargers will ruin Lithium batteries.
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SOURCE: Will the ryobi nicad charger also charge the
No, but the Lithium charger will charge the NiCads.
SOURCE: Dear Sir/Madam, I would like to
you shouldnt have a problem with it, but you can also go to their webpage and research there if there is any farther doubt.
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