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What is the battery model for the Mercedes-Benz E300L car key?

2 Answers
LaKennedy
08/26/25 5:12am
The battery model is CR2032. It is a lithium manganese dioxide battery, named according to the IEC standard. Among them: C- indicates the 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.), its lifespan can be further extended to 8 years or even 10 years. The usage time of the 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, the mechanical key can be used directly to open the vehicle and start the engine. 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, and it is one of the most common car remote batteries. The voltage of this battery is 3V, while general car key batteries are powered by 9V, so all three batteries must be replaced each time. 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, 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 stable manganese dioxide, the negative electrode material 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 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.
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AustinMarie
09/08/25 7:12am
I've been driving a Mercedes-Benz E300L and have replaced the key battery several times myself. The battery model is CR2025, the small coin-type battery. Last time, when the key suddenly stopped responding, I thought the car was broken, but it turned out the battery was just dead. You can replace it by prying open the back cover, but be gentle to avoid damaging the internal parts of the key. You can easily buy CR2025 batteries at supermarkets or online for just a dollar. The battery typically lasts about two years, so I recommend checking it every year and a half. If the remote control distance shortens or unlocking becomes sluggish, it's a sign of weak signal. Replacing the battery will immediately restore its responsiveness. Most other Mercedes-Benz models also use CR2025, but the E300L definitely uses this standard model. Avoid keeping the key and your phone together as magnetic attraction might accelerate battery drain. Keeping a spare battery in the car is handy for emergencies.
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