I don't shop at walmart either, that set is available from many sources. I posted it as an example of what is available. Just trying to help, that set has served me well. I don't give a fuck about your batteries.
Home Depot wants around $50 for 1
This one came with a weedwacker a couple years ago
Bought a lighter/lower profile 1 last year
Weedwacker is the only Ryobi tool I have
So I ain't buying another battery