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Found this perusing the tools section at my local Home Depot in CT. YMMV of course.
Ryobi HP Battery Kit 2ah, 4ah, 6ah and Charger – Home Depot in Store
In store SKU 033287209866
Ryobi HP Battery Kit 2ah, 4ah, 6ah and Charger – Home Depot in Store
In store SKU 033287209866