What does 1V mean for lithium battery of electric tools

For lithium-ion batteries, the nominal voltage is approximately 3.7-volt per cell which is the average voltage during the discharge cycle. The average nominal voltage also means a balance between energy capacity and performance. Additionally, the voltage of lithium-ion battery systems may differ slightly due to variations in the specific chemistry.

A lithium battery voltage chart can help you track charge levels and avoid issues like overcharging or deep discharging. By keeping an eye on your battery's voltage range, you'll boost its lifespan and ensure your devices perform at their best.

The SoC voltage chart for lithium batteries shows the voltage values with respect to SoC percentage. A Li-ion cell when fully charged at 100%SoC can have nearly 4.2V. As it starts to discharge itself, the voltage decreases, and the voltage remains to be 3.7V when the battery is at half charge, ie, 50%SoC.

Its nominal voltage is 3.6V or 3.7V, the fully charged voltage is 4.2V, and the discharge cut-off voltage is 3V. You see, from 4.0V to 3.6V, the voltage does not change much, but the power may drop from 80% to about 20%. The following chart 2 is the discharge curve of lithium iron phosphate battery.

Battery voltage is essentially the charge difference between the negative and positive terminals of a battery. All batteries, including those used in electric power tools, have a negative terminal and a positive terminal. The difference between these terminals is measured in voltage. A higher voltage indicates a stronger and more powerful battery.

Nominal voltage: This is the most common voltage on the battery label, such as 3.7V. It represents the average voltage of the battery during most of the discharge process. It is not fixed, and the voltage of the battery is not this number when it is fully charged or almost empty, so it is called nominal.