I was thinking I'd have preferred a mower that uses my existing 18v batteries in series to produce something approaching 40v. That's an extra charger on my workbench now. My guess is Ryobi wanted to take the possibility of the 2 battery packs being at different states of health out of the equation by combining it into a single pack. That, and more profit selling a different battery. Their whole marketing though is that all their tools use the share the same battery connector so there is always backwards and forwards compatibility.
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