But if you're old NiCad charger dies, you might find yourself wondering if one of the new 18V One+ battery chargers would work in its stead. Unfortunately, that doesn't seem to be the case. Ryobi ...

Both the regular charger and the fast charger can juice up any Ryobi One+ Lithium battery, no matter the amperage. However, 18V One+ batteries are the only batteries that they are rated to work with.