Don't know the answer, but Ryobi tech support is terribly non-techincal.

Had a problem and question, similar to yours about batteries and chargers.
Got zero help from TS - guy did not know enough to communicate on the
subject.

RichK

"Cactus Jack" wrote in message
The new Ryobi Lithium 18v batteries are compatible with all their
existing One+ tools. I've looked everywhere to find out whether they
can be recharged in the existing 18v One+ chargers? If so, will we be
able to buy JUST the battery? Currently the only option, without
buying a new tool, is a combo battery and new model charger for $99.
I'd like to get a couple or 3 of these new batteries, but I won't pay
$99 for a battery and a changer I may not need.