A typical lithium-ion battery cell usually has a nominal voltage of around 3.7 to 3.8 volts. This nominal voltage represents the average operating voltage during most of the battery's discharge cycle. However, the actual voltage can vary depending on the specific chemistry and design of the battery. For example, lithium iron phosphate (LiFePOβ) batteries typically have a lower nominal voltage of about 3.2 volts, while other lithium-ion chemistries might have slightly higher nominal voltages.
It's important to note that the voltage of a lithium-ion battery cell also changes during charging and discharging. During charging, the voltage increases above the nominal voltage, and during discharge, it decreases. The exact voltage levels and behavior can also be influenced by factors such as state of charge, temperature, and load conditions.