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Rebuilding a Ryobi 18v NiCad Battery CubicleNate Powertools , Repair 1 June 2020 4 Minutes This was one of those unscheduled projects that I really had no intention of doing but when you have a persistent 9 year old that wants to take apart and rebuild a battery for some Ryobi tools, sometimes, you just have to give in.Check the label on the Ryobi battery pack to find out the type of cells it has in it. If it says nickel cadmium (NiCad) or nickel metal hydride (NiMH), continue to fix your Ryobi battery. If it says lithium ion or lithium polymer, replace the entire battery or take the battery to a professional for repair.