What is the battery model for the CX-4 car key?

[Evie]

The battery model is CR2025. 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 it were square, it would be denoted by F. 20 - Indicates the battery diameter is 20mm. 25 - Represents the battery height of 2.5mm. The nominal voltage is 3.0V, the endpoint voltage is 2.0V, and the rated capacity ranges from 140-170mAh. CR2025 typically has a lifespan of 5 years. However, if the manufacturer's production standards are low or quality control is poor, the lifespan may 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 extend further to 8 or even 10 years. The usage time of a car remote key battery is closely related to frequency of use. The more frequently it is used, the shorter its lifespan. If the remote key battery runs out, 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. Owners can refer to the user manual for the specific battery model required for replacement. Button-type CR2016 battery: This is one of the most commonly used remote key batteries. Its voltage is 3V, while most car key batteries operate at 9V, so all three batteries must be replaced simultaneously. Examples include brands like Honda, Toyota, Volkswagen, and Mazda. CR2016 specifications: 20mm diameter, 1.6mm thickness. Button-type CR2025 battery: Its usage rate is much lower than CR2016, but some car keys still use it. It is thicker than the CR2016 but offers higher storage capacity. CR2025 specifications: 20mm diameter, 2.5mm thickness. This type is also commonly used in audio remotes. Button-type CR2032 battery: Also 3V, but with a capacity of around 200mAh, making it twice as thick as the CR2016. The 3V-CR2032 lithium-manganese battery follows 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 shape resembles a button, hence the name lithium button battery or lithium-manganese button battery. Button-type CR2450 battery: This is thicker and larger compared to the other three, with a diameter of 24.5mm and height of 5.0mm. The rated current for CR2450 is 0.2mA, primarily used in low-power electronics. It can provide an output current of 0.001mA to 5mA, with a continuous output of up to 15mA and a pulse output of up to 30mA, meeting the requirements for light, sound, and RF output in small electronic devices. Owners can refer to the user manual for the specific battery model required for replacement.