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 don't unexpectedly run out mid-job.