A typical coin cell battery, also known as a button cell battery, usually has a voltage rating of 3 volts. This is the case for popular types like CR2032, CR2025, and LR44/A76 batteries, which are commonly used in various electronic devices such as calculators, watches, remote controls, and small electronic gadgets. It's important to note that the voltage rating can vary depending on the specific chemistry and design of the battery, but 3 volts is a common standard for many coin cell batteries.