What is the battery model for the Mercedes-Benz E260L car key?

[StChristopher]

The battery models are CR2032 and CR2025. These are lithium manganese dioxide batteries, 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 a battery height of 3.2mm; 25 represents a height of 2.5mm. 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 standards are 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 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 lifespan. If the remote key battery runs out, the mechanical key can be used directly to unlock and start the vehicle. Car remote keys use button batteries, primarily models such as CR2016, CR2025, CR2032, and CR2450. The specific model for each key can be found 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 three batteries need to be replaced each time. Examples include Honda, Toyota, Volkswagen, Mazda, etc. CR2016 specifications: battery diameter is 20mm, thickness is 1.6mm. Button-type CR2025 battery: Its usage rate is much lower than CR2016, but some car keys still use it. It is thicker than the 2016 model but has a relatively higher storage capacity. CR2025 specifications: battery diameter is 20mm, thickness is 2.5mm. This type of battery is also commonly used in audio remotes. Button-type CR2032 battery: Its thickness is twice that of 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 lithium button battery or lithium-manganese button battery. Button-type CR2450 battery: 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 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 a continuous output current of up to 15mA and a flash output current of up to 30mA, meeting the requirements for light emission, sound output, and RF output in most small electronic products.

[DeMarley]

Last time I replaced the key battery for my Mercedes-Benz E260L myself, using a CR2025 button battery. This type of battery can be easily found in supermarkets, and the Panasonic brand costs just around ten yuan. Replacing the battery is super simple: pull out the mechanical key, use your fingernail to pry open the plastic shell along the seam, and you'll find the battery model marked at the bottom of the battery compartment. Remember to buy the same type of battery in advance to avoid last-minute panic. When replacing, make sure the positive side of the battery faces upwards. After installation, test the key to ensure the window control function works properly. I've replaced the battery twice in three years for this key. Keeping the key in your pants pocket can easily press the buttons, leading to battery drain, so it's better to hang it on a keychain. Recently, I found CR2025 battery kits with tools available online, which are quite practical.

[BenjaminFitz]

The Mercedes-Benz E260L remote key uses a CR2025 button battery, which is commonly available in electronic stores. I personally checked the model number by scanning the QR code with the Xiaomi phone app and confirmed it's the correct one. Replacing the battery is simple: pull out the mechanical key, then gently pry open the back cover with a small screwdriver. Remember to clean the metal contacts in the battery compartment with an alcohol wipe before replacing the battery, as oxidation can affect conductivity. My car key lasted almost four years before needing a second replacement, and I later realized it was because I habitually left the key under the windshield in direct sunlight while parked—high temperatures can cut the battery's lifespan in half. It's best to keep two spare batteries in the glove box, as running out of power unexpectedly can be troublesome. When buying batteries, check the expiration date and avoid stocking up for too long.