40V 6.0Ah OP4040 Battery Replacement for Ryobi Battery Collection Cordless Power Tools

What you are looking at is 40V 6.0Ah OP4040 Battery Replacement for Ryobi Battery Collection Cordless Power Tools, a product. Between versions of the same thing, it is usually the details — capacity, finish, what is included — that separate them. Check the measurements and the contents against what you already own before choosing. Where one is discounted, compare the size and edition rather than the headline alone. Keep the packaging and paperwork until you are sure it is a keeper — returns are simpler with both. The cheapest listing is not automatically the best deal: delivery and any code applied at checkout decide that.