Battery voltage plays a large role in how well your tool performs, but what exactly is voltage, and how is it calculated? A battery's voltage is determined by its cell count. Typically, each lithium-ion cell has a nominal voltage of 3. When you connect five cells in series (standard for most cordless tools), you get: However, when the battery is fully charged, each cell actually reaches 4. 0 volts, giving: So both 18V. . When cordless power tool brands switched to Li-ion battery technologies, they spec'ed and advertised batteries according to two fundamental characteristics – voltage and charge capacity, with units of volts and amp-hours, respectively. Voltage is a widely-understood concept, and amp-hours less so. . Power tool batteries have many different voltages, usually ranging from 12V to 60V, or even higher.
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