What is the battery model for the Mercedes-Benz GLA220 car key?
3 Answers
The battery model is CR2025. 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 battery shape is cylindrical, with F replacing it if it is square; 20 indicates that the battery diameter is 20mm; 25 represents that the battery height is 2.5mm. The nominal voltage is 3.0V, the endpoint voltage is 2.0V, and the rated capacity varies between 140-170mAh. CR2025 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 greatly shortened. Domestic first-tier brand batteries can generally guarantee this lifespan. If the usage environment is ideal (sealed, room temperature, free from moisture, etc.), the 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, the mechanical key can be used directly to open and start the vehicle. The batteries used in car remote keys are button batteries, mainly three types: CR2016, CR2025, and CR2032. For the specific model used in each vehicle, owners 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 car remote batteries. The voltage of this battery is 3V, and most car key batteries are powered by 9V, so three batteries need to be replaced each time. Examples include Guangben, 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 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 is 20mm, thickness is 2.5mm. This type of battery is also commonly used in audio remotes. Button-type CR2032 battery: The voltage is also 3V, but the capacity is around 200mAh, making it twice as thick as the 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 ethylene glycol dimethyl ether, 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 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.
I just replaced the key battery for my GLA220 last year, and the battery model is CR2025. Opening the key back cover is extremely simple—just gently pry it open with a coin along the seam, but be careful not to use too much force and break the clips. When removing the old battery, remember the orientation with the positive side facing up. When inserting the new battery, make sure to handle it with dry hands to avoid sweat affecting the contacts. I recommend buying Sony or Panasonic brand batteries—you can get a pack of five for just over ten yuan at the supermarket, and keeping spares in the glove box is very convenient. Key batteries typically last two to three years. If you notice the remote range shortening or the unlocking becoming sluggish recently, those are signs it’s time for a replacement. Before reassembling the key, remember to test the lock and unlock functions to ensure the contacts are working properly before closing the cover.
As someone who frequently helps friends with car key issues, I can confirm the Mercedes-Benz GLA220 key fob uses a CR2025 battery. No special tools are needed for replacement - the key casing has small grooves on the side where you can pry open the back cover with your fingernail. The crucial detail is battery orientation: install it with the printed side facing down to align with the metal contact spring. I usually buy CR2025 batteries at convenience stores, just make sure to get the standard 3V version. Once encountered someone mistakenly purchasing CR2032 batteries - while similar in diameter, they're 0.7mm thicker and could damage the housing if forced. A quick tip: faster battery drain in winter is normal; don't panic if remote range reduces by one-third at -10°C temperatures. If problems persist after replacement, try using the spare key to rule out receiver malfunctions.
