Most battery-powered hand tools use at least one of three battery packs: 18V (Volt) for standard power tools, 12V for compact and lower-power-demand tools, and 36V or higher for some outdoor gardening ...
I’ve found that Festool’s 5.2Ah, 93.6Wh battery pack provides sufficient power and runtime for a full day’s work with handheld power tools like drill/drivers, sanders, oscillators, and routers.