What is the battery model for the Porsche Cayenne key?

[StKaylee]

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, and if it is square, F is used instead; 20 indicates that the battery diameter is 20mm; 32 represents the battery height of 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, free from moisture, etc.), the lifespan can be further extended to 8 years or even 10 years. The usage time of a 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 and start the vehicle. Car remote keys use button batteries, mainly including models: CR2016, CR2025, CR2032, and CR2450. For the specific model used in each key, owners can refer to the battery model in the user manual for replacement. Button-type CR2016 battery: The usage rate of car key remotes is very high, and it is almost one of the most common remote batteries. The voltage of this battery is 3V, while general car key batteries are powered by 9V, so each time the battery is replaced, three batteries need to be changed. Examples include: Guangben, Toyota, Volkswagen, Mazda, etc. CR2016 specifications: battery diameter 20mm, thickness 1.6mm. Button-type CR2025 battery: Its usage rate is much lower than that of CR2016. However, 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 20mm, thickness 2.5mm. This type of battery is also commonly used in audio remotes. Button battery CR2032: 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 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. Button battery CR2450: Compared to the other three models, it is thicker and larger, with a diameter of 24.5mm and a height of 5.0mm. The rated current value of CR2450 is 0.2mA, mainly used in low-power electronic products. Generally, the battery can provide an output current of 0.001mA to 5mA, with a continuous output current of up to 15mA and a flash output current of up to 30mA, meeting the requirements of most small electronic products for light emission, sound production, and radio frequency output.

[StJameson]

My Porsche Cayenne has been running for five years, and I've encountered the key battery issue multiple times. The model is mostly CR2032, a coin-shaped 3V lithium battery, which can be easily purchased at supermarkets or online. Common brands like Panasonic or Duracell work well. Changing the battery is quite simple for me: first, gently pry open the key casing with a small screwdriver or coin (be careful not to damage the plastic with too much force), then remove the old battery and insert a new one. The key is to ensure the electrode direction is correct—positive side up—and press it lightly to secure it. Here’s a tip: if the remote sometimes malfunctions, it’s not necessarily a dead battery—it could be signal interference or dirt inside the key. Try cleaning the contacts with an alcohol swab and test again. By the way, battery life is usually one to two years, but frequent use or high temperatures can shorten it. Regular checks can prevent locking troubles; I test the button response once a month. If the battery keeps dying, it might be due to poor-quality batteries or wear in the key circuit, so it’s best to visit a professional shop. Overall, DIY is easy and cost-effective—practice makes perfect.