What is the battery model for the 2018 Tiguan L car key?

[McLukas]

The battery model for the 2018 Tiguan L car key is CR2032. It 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, F is used instead); 20 - Indicates the battery diameter is 20mm; 32 - Indicates the battery height is 3.2mm. The nominal voltage is 3.0V, endpoint voltage is 2.0V, and rated capacity is approximately 200mAh. CR2032 batteries typically last about 5 years. However, if the manufacturer's production standards or quality control are poor, the lifespan can be significantly reduced. Top domestic brands generally guarantee this lifespan. Under ideal conditions (sealed, room temperature, no moisture, etc.), the lifespan can extend to 8 or even 10 years. The usage time of a car remote key battery is highly dependent on frequency of use—more frequent use shortens the lifespan. If the remote key battery dies, the mechanical key can still be used to unlock and start the vehicle. Car remote keys typically use button batteries, mainly three types: CR2016, CR2025, and CR2032. The specific model used for each vehicle can be found in the owner's manual. Button-type CR2016 battery: This is one of the most commonly used car remote batteries. Its voltage is 3V, while most car key batteries operate at 9V, so three batteries are usually replaced at once. Common in brands like Honda, Toyota, Volkswagen, and Mazda. Specifications: 20mm diameter, 1.6mm thickness. Button-type CR2025 battery: Less commonly used than CR2016 but still found in some car keys. It is thicker than CR2016 but offers higher storage capacity. Specifications: 20mm diameter, 2.5mm thickness. This type is also often used in audio remotes. Button-type CR2032 battery: Twice as thick as CR2016. The 3V-CR2032 lithium-manganese battery has a lithium-manganese dioxide structure. The positive electrode is chemically stable manganese dioxide, the negative electrode is lithium metal, and the electrolyte is a lithium battery solution. Its main components are dimethoxyethane, propylene carbonate, and lithium perchlorate. Shaped like a button, it’s also called a lithium button battery or lithium-manganese button battery. Button-type CR2450 battery: Thicker and larger than the other three, with a diameter of 24.5mm and height of 5.0mm. The rated current for CR2450 is 0.2mA, mainly used in low-power electronics. Generally, these batteries can provide 0.001mA to 5mA output, with continuous output up to 15mA and pulse output up to 30mA, meeting the needs of small electronics for light, sound, and RF output.