What is the battery model for a Porsche key?
2 Answers
The battery model is CR2032. It is a lithium manganese dioxide battery, named according to the IEC standard. The details are 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 it were square, F would be used instead; 20 - Indicates 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 batteries typically have a lifespan of 5 years. If the manufacturing level is low or quality control is poor, the lifespan can be significantly shortened. Domestic first-tier brand batteries can generally guarantee this lifespan. Under ideal conditions (sealed, room temperature, no moisture, etc.), the lifespan can be extended further to 8 or even 10 years. The usage time of a car remote key battery is closely related to the frequency of use—the more frequently it is used, the shorter the lifespan. If the remote key battery runs out, the vehicle can still be opened and started using the mechanical key. Car remote keys use button batteries, primarily in models such as CR2016, CR2025, CR2032, and CR2450. For the specific model used in each key, owners can refer to the battery model listed in the user manual for replacement. Button-type CR2016 battery: This is one of the most commonly used remote key batteries. The battery voltage is 3V, while most car key batteries operate at 9V, so all three batteries must be replaced each time. Examples include models from Honda, Toyota, Volkswagen, and Mazda. CR2016 specifications: battery diameter of 20mm, thickness of 1.6mm. Button-type CR2025 battery: Its usage rate is much lower than CR2016, but it is still used in some car keys. It is thicker than CR2016 but has a relatively higher storage capacity. CR2025 specifications: battery diameter of 20mm, thickness of 2.5mm. This type of battery is also commonly used in audio remotes. Button-type CR2032 battery: It is twice as thick as CR2016. The 3V-CR2032 lithium manganese battery has a lithium-manganese dioxide structure. The positive electrode material is chemically stable manganese dioxide, the negative electrode is lithium metal, and the electrolyte is a lithium battery electrolyte. The main components of the electrolyte are dimethoxyethane, propylene carbonate, and lithium perchlorate. Its shape resembles a button, hence the name button lithium battery or lithium manganese button battery. Button-type CR2450 battery: Compared to the other three, it is thicker and larger, with a diameter of 24.5mm and a height of 5.0mm. The rated current value for CR2450 is 0.2mA, mainly used in low-power electronic products. Generally, such batteries can provide an output current of 0.001mA to 5mA, with continuous output current up to 15mA and pulse output current up to 30mA, meeting the requirements of most small electronic products for light emission, sound, and RF output.
Most Porsche car keys use CR2032 coin cell batteries, and all three Porsches I've owned took this type. It's actually quite simple to replace it yourself: just pry open the back cover with a small screwdriver, make sure not to reverse the polarity when installing the new battery, then snap the cover back into place with a click. Last time I bought a pack of five Nanfu CR2032 batteries at the supermarket for ten yuan, and they've lasted me till now. However, it's worth noting that some newer electric vehicle keys might use CR2354 batteries - my neighbor's Taycan uses this slightly thinner type. After replacement, I recommend wiping the key contacts with an alcohol swab, as poor contact can be more frustrating than a dead battery. When you notice the remote control range shortening, it's time to prepare for a replacement - don't wait until it completely stops working.
