What is the battery model for the Mercedes-Benz C200L key?

[DelReed]

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 shape of the battery is cylindrical. 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 as 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. Under ideal usage conditions (sealed, room temperature, no moisture interference, etc.), its lifespan can be further extended to 8 years 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 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. The batteries used in car remote keys are button batteries, mainly including models: CR2016, CR2025, CR2032, and CR2450. For the specific model used in each key, the owner 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, making it one of the most common remote batteries. The voltage of this battery is 3V. Generally, 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 CR2016. However, some car keys still use it. It is relatively thicker than CR2016 but has a 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 dimethoxyethane, propylene carbonate, and lithium perchlorate. Its shape resembles a button, hence it is called a 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, batteries 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.

[VonDawson]

I've been driving a Mercedes-Benz C200L for almost four years, and the key fob battery is a CR2025 model. Shortly after I bought it, the battery died once, and I replaced it myself. The process was quite simple: use a small Phillips screwdriver to gently pry open the key fob casing, being careful not to scratch the plastic cover, then use tweezers to remove the old battery and insert a new CR2025, ensuring the positive side faces up. The battery typically lasts about two years, depending on usage frequency—for example, daily unlocking will drain it faster. It's always a good idea to keep a spare battery in the car's drawer, so you won't panic if it suddenly dies. If the key fob runs out of power, Mercedes-Benz also provides a mechanical key for emergency access. Additionally, opting for branded batteries is safer, as cheap ones might leak and corrode the circuitry, which is crucial for keyless start security.

[VonNaomi]

I think the battery for the Mercedes-Benz C200L key is CR2025, which is a very common model. Replacing the battery isn't difficult: find a thin screwdriver or a special tool, first remove the small screw, then gently pry open the key shell. Once you see the battery slot, take out the old one and install the new CR2025. The battery life is generally 24-36 months, depending on usage. It's recommended to buy original or well-known brands for spare batteries to ensure stable voltage. If the battery runs out, the key may malfunction and affect the keyless function, but don't worry, the mechanical keyhole hidden in the key can be used in emergencies. From a practical perspective, regularly pressing the key button to check if the light comes on can help detect issues early.