What is the battery model for Volkswagen Golf 7 key?

[MargaretLynn]

The battery model is CR2025. 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 shape of the battery is cylindrical, if it is square, F is used instead; 20 indicates that the diameter of the battery is 20mm; 25 represents the height of the battery is 2.5mm. The nominal voltage is 3.0V, the endpoint voltage is 2.0V, and the rated capacity ranges from 140-170mAh. CR2025 usually 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 basically guarantee this lifespan. If the usage environment is ideal (sealed, room temperature, no 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 of power, you can directly use the mechanical key to open the vehicle and start the engine. 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, 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 almost one of the most common car remote batteries. The battery voltage of this battery is 3V, and the general car key battery is powered by 9V, so every time the battery is replaced, three batteries need to be replaced. 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 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: The voltage is also 3V, but the capacity is around 200mAh, so the 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 ethylene glycol dimethyl ether, propylene carbonate, and lithium perchlorate. It is shaped like a button, hence the name button lithium battery or lithium manganese button battery. Button battery CR2450: Compared to the other three, 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, 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.

[AngelaRose]

I remember the battery model for my Volkswagen Golf 7 key was CR2032, a round coin cell battery. After driving for almost three years, the remote door lock started acting up—the signal strength was inconsistent. I opened the key casing myself and checked—the battery had "CR2032" printed on the front, the 3-volt type. Replacing it was super easy: just use a coin or a small knife to pry open the plastic shell, take out the old battery (don’t lose the small washer), insert the new battery with the positive side facing up, and gently press the cover back in place. Don’t randomly buy other models like CR2025—if the voltage is insufficient, the remote range may shorten, and it could even loosen the key circuit. I recommend buying original-brand batteries from supermarkets or online—they’re cheap, durable, and can last one or two years without issues, preventing awkward situations where the key suddenly fails while driving. Also, keep the battery contacts clean and dry to avoid dust or rust buildup.

[OHolden]

The Volkswagen Golf 7 key battery is mostly the CR2032 type, with a diameter of 20mm and a thickness of 3.2mm, featuring a standard lithium-ion button cell design. I've tinkered with this myself: before replacing, diagnose whether it's a battery issue, such as testing if the remote responds slowly when near the car door, which is a typical symptom. When disassembling the key, be gentle; use a tool to pry open the small gap on the side, being careful not to break the clips or bend the contacts, as this could affect signal reception. It's recommended to use a multimeter to test the old battery—if the voltage drops below 2.8V, it's time for a replacement. After replacing, test the remote's functionality and range to ensure all buttons work properly. Remember, installing the battery backward can damage the key module, but with a bit of care, you can handle it yourself, saving unnecessary expenses at the dealership.

[ORonan]

The battery for my Golf 7 key is CR2032, which can generally be purchased at auto parts stores or pharmacies. It's time to replace it when the key remote becomes unresponsive. I've opened it myself before: there's a seam in the middle of the key casing, gently pry it open with a small screwdriver, remove the old battery and replace it with a new one, being careful not to damage the small components inside. Make sure not to get the model wrong; CR2032 is suitable for this car model, and using others may not be as durable. It's advisable to carry a spare new battery for emergencies, so you won't panic when you're out and about.