The problem that a lot of folks have with the Rechargeable/ Cordless Tools is that they just don't use them enough to keep the Battery Pack in good condition.
Those Ryobi Tool designers figured that out and came up with a workable solution to the problem!
They have a whole range of Cordless Tools that share the same Battey Pack so the average Homeowner gets better utilization and actually conditions the Batteries better through use rather than letting them sit on a shelf .
There are other makers who are offering similar Tool sets!
None of them will totally replace their corded Cousins ,but it is quite amazing seeing them doing jobs that I would have thought impossible a few Years back!