Ryobi one 18v li ion batteries and chargers ryobi 5133001905 this 18v battery from ryobi has improved lithium technology providing more power longer runtimes and increased durability compared to older versions combined with a number of tools in the one range from angle grinders to drills and torches less time is spent charging and changing batteries the four stage fuel gauge shows remaining power at 100 75 50 and 25 so you dont unexpectedly run out mid job ryobi 5133001905 rb18