What is the battery model for the Audi A5 key?
3 Answers
The battery model is CR2032. It is a lithium manganese dioxide battery, named according to the IEC standard. Among them: C- indicates a chemical battery system with lithium metal as the negative electrode and manganese dioxide as the positive electrode; R- indicates that the battery shape is cylindrical. If it is square, F is used instead; 20 indicates the battery diameter is 20mm; 32 represents the battery height is 3.2mm. The nominal voltage is 3.0V, the endpoint voltage is 2.0V, and the rated capacity is approximately 200mAh. CR2032 typically has a lifespan of 5 years. If the manufacturer's production level is not high or quality control is poor, its lifespan will be significantly shortened. Domestic first-tier brand batteries can generally guarantee this lifespan. If the usage environment is ideal (sealed, room temperature, no moisture interference, etc.), the lifespan can be further extended to 8 years or even 10 years. The usage time of the vehicle remote key battery is closely related to the frequency of use. The more frequently it is used, the shorter the usage time will be. If the remote key battery runs out of power, you can directly use the mechanical key to open the vehicle and start the engine. The battery used in car remote keys is a coin cell battery, mainly using three types: CR2016, CR2025, and CR2032. For the specific model used in each vehicle, owners can refer to the battery model in the user manual for replacement. Coin-type CR2016 battery: The usage rate of this battery in car key remotes is very high, making it one of the most common remote key batteries. The battery voltage is 3V, and most car key batteries are powered by 9V, so three batteries need to be replaced each time. Examples include: Guangben, Toyota, Volkswagen, Mazda, etc. CR2016 specifications: battery diameter is 20mm, thickness is 1.6mm. Coin-type CR2025 battery: Its usage rate is much lower than CR2016, but it is still used in some car keys. It is thicker than the 2016 model but has a relatively higher storage capacity. CR2025 specifications: battery diameter is 20mm, thickness is 2.5mm. This type of battery is also commonly used in audio remotes. Coin-type CR2032 battery: Its thickness is twice that of CR2016. The 3V-CR2032 lithium manganese battery belongs to the lithium-manganese dioxide structure. The positive electrode material is chemically very stable manganese dioxide, the negative electrode material is lithium metal, and the electrolyte is a lithium battery. The main components of the electrolyte are dimethoxyethane, propylene carbonate, and lithium perchlorate. It is shaped like a coin, hence the name coin lithium battery or lithium manganese coin battery.
I've been driving an Audi A5 for a while, and the key battery model is CR2032, which is that round coin-shaped battery. I've replaced it several times. The first time the battery died was in a parking lot when I couldn't open the door, which was a bit nerve-wracking, but later I bought a CR2032 and replaced it myself. The steps are simple: gently pry open the key casing with a small coin or screwdriver, remove the old battery, and make sure to install the new battery with the positive side facing up. The battery life is about two to three years, and I recommend car owners check or replace it regularly. If the model doesn't match, it might be an older car model—check the manual or ask the dealer. Usually, keeping the key in a wallet reduces button presses, and avoid exposing it to hot water or dropping it to prevent faster wear. Always keep a spare key handy for emergencies, using the mechanical part to open the door. Overall, the batteries are very cheap, just a few dollars at the supermarket, and doing it yourself saves hassle.
I enjoy tinkering with my car myself. The battery for the Audi A5 key is a CR2032, which is easy to replace on your own. First, pry open the key and remove the mechanical part, then use a small plastic tool to gently open the casing, being careful not to damage the internal circuitry. When replacing the battery, make sure to install it with the correct polarity. After installation, test the remote to ensure it works properly. The battery typically lasts over two years, but frequent use can shorten its lifespan. I keep a few spare batteries on hand—they’re cheap to buy online. Avoid leaving the key in direct sunlight, like on the dashboard, as high temperatures can drain the battery. If the key functions abnormally after replacement, try reassembling it. Overall, doing it yourself costs less than five bucks and is much faster and cheaper than taking it to a shop.
