I have a LIKE NEW Ryobi 40v 6ah battery that has only been used a handful of times that wouldn't charge when I went to use it last weekend. I read that it can be reset using several different methods, but I need a special socket, which I don't have. I needed a battery ASAP, so I just bought a new one at Home Depot for $199, dang that hurt!
So this might be a great bargain for someone who has experience resetting Ryobi batteries.
I will include a BRAND-NEW charger as well because I have several extras that I don't need.