What model of battery does a car key use?
2 Answers
There are three types of batteries commonly used in car keys: 1. CR2016 button-type battery. This model of button battery is highly prevalent in modern car key remotes and is one of the most universal car remote batteries. These batteries have a voltage of 3V, and since car key remotes typically require 9V, all three batteries need to be replaced at the same time. 2. CR2025 button-type battery. This model is far less commonly used than the CR2016. It is thicker than the CR2016 but has a higher energy storage capacity. The specifications of the CR2025 are: battery diameter of 20mm and thickness of 2.5mm. This model is often used in audio remote controls. 3. Alkaline 12V battery. The 12V alkaline battery was commonly used in early car key remotes and electric rolling doors in shops. Older models of car key remotes, such as those from Honda and Toyota, often used this type of battery.
As someone who has driven many cars, I change the key fob battery myself when it runs out of power. The most common model is the CR2032, a coin cell battery frequently used in brands like Toyota, Honda, and Volkswagen—I’ve replaced it three or four times myself. Battery life typically lasts two to three years, depending on usage frequency. I recommend checking the small label on the back of the key or the manual to confirm the model first, as different brands may use CR2025 or CR2450. For example, Mercedes keys sometimes use CR2450, so double-check to avoid buying the wrong one. To save money, you can find these batteries at supermarkets or hardware stores for just a few dollars each. Replacing it is simple—just pry open the key casing with a screwdriver. Don’t forget to test the new battery and try the remote functions after locking the car door to avoid mid-drive failures, which can be both unsafe and inconvenient. DIY replacement saves on repair costs and is hassle-free.
