What is the battery model for Audi A6 car key?
2 Answers
The battery model is CR2032. It is a lithium manganese dioxide battery, named according to the IEC standard. Among them: C- indicates the chemical battery system with lithium metal as the negative electrode and manganese dioxide as the positive electrode; R- indicates that the shape of the battery is cylindrical, and if it is square, F is used instead; 20 indicates that the diameter of the battery is 20mm; 32 represents the height of the battery is 3.2mm. The nominal voltage is 3.0V, the endpoint voltage is 2.0V, and the rated capacity is about 200mAh. CR2032 usually has a lifespan of 5 years. If the manufacturer's production level is not high or quality control is poor, its lifespan will be greatly shortened. Domestic first-tier brand batteries can basically guarantee this lifespan. If the usage environment is ideal (sealed, room temperature, no moisture, etc.), its lifespan can be further extended to 8 years or even 10 years. The usage time of the car 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 car and start the vehicle. Car remote keys use button batteries, mainly three types: CR2016, CR2025, and CR2032. For the specific model used in each vehicle, the owner can replace the battery according to the battery model in the user manual. Button-type CR2016 battery: The usage rate of car key remotes is very high, and it is almost one of the most common car remote batteries. The battery voltage of this battery is 3V, and generally, car key batteries are powered by 9V, so every time the battery is replaced, three batteries need to be replaced. Examples include Guangben, Toyota, Volkswagen, Mazda, etc. CR2016 specifications: battery diameter is 20mm, thickness is 1.6mm. Button-type CR2025 battery: Its usage rate is much lower than CR2016. However, some car keys still use it. 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. Button battery CR2032: The 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 metallic lithium, and the electrolyte is a lithium battery. The main components of the electrolyte are ethylene glycol dimethyl ether, propylene carbonate, and lithium perchlorate. It is shaped like a button, hence the name button lithium battery or lithium-manganese button battery.
My Audi A6 has been running for over five years, and the car key battery has always been a CR2032 coin cell, which is compatible with most Audi models. It's quite easy to replace—just gently pry open the key's back cover with a coin or a small screwdriver and carefully remove the old battery. Don't worry about breaking it; the key's structure is designed to be sturdy. When the battery dies, remote functions like locking the car will fail, but thankfully the manual keyhole still works. You can buy CR2032 batteries for a few bucks at supermarkets or auto parts stores, and I always keep one or two in the car for emergencies. It's recommended to check the battery annually; if the key's indicator light dims, it's time for a replacement. By the way, there might be slight variations in the keys of different A6 model years, but the battery is generally the same. After replacement, functions are restored immediately—saving both money and hassle.
