The battery model for the Audi A3 key is CR2032. CR2032 is a lithium manganese dioxide battery, named according to the IEC standard. The breakdown is as follows: C - Indicates a chemical battery system with lithium metal as the negative electrode and manganese dioxide as the positive electrode; R - Indicates the battery shape is cylindrical (if square, it would be denoted by F); 20 - Indicates the battery diameter is 20mm; 32 - Represents the battery height of 3.2mm. The nominal voltage is 3.0V, with an endpoint voltage of 2.0V. The rated capacity varies between 200-240mAh depending on the manufacturer's standards. Typically, the shelf life of a CR2032 battery is 5 years, but this can be significantly shorter if the manufacturing quality is poor. Domestic first-tier brands generally guarantee this lifespan. Under ideal conditions (sealed, room temperature, no moisture, etc.), the lifespan can extend to 8 years or even 10 years. Generally, replacing a car key battery involves the following three steps: Step 1: Remove the mechanical key. Press the latch on the side of the smart key to release the mechanical key. Step 2: Open the battery cover. After removing the mechanical key, you will notice a deep slot and a shallow slot at the top of the smart key. The deep slot is for the keyhole, while the shallow slot is used to open the battery cover. Insert the mechanical key into the shallow slot and pry it open to reveal the coin battery. Gently remove the old battery. Step 3: Replace the battery. Insert the new battery, then reassemble the battery cover and mechanical key in sequence to complete the replacement.
