What is the battery model for the Peugeot 408 key?

[Russell]

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 battery is cylindrical in shape, with F replacing it if it is square; 20 indicates that the battery has a diameter of 20mm; 32 represents a 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 a 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, the mechanical key can be used directly to open 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, 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 remote battery types. The voltage of this battery is 3V, while most car key batteries are powered by 9V, so all three batteries need to 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 very stable manganese dioxide, the negative electrode material is metallic lithium, 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 it is referred to as 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, 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 RF output.

[EmeryLynn]

I just dealt with this issue a couple of days ago! My three-year-old Peugeot 408 suddenly showed a key battery warning. I opened the key fob and found a flat coin battery inside, model CR2025. Remember to buy genuine batteries first - those cheap roadside ones don't last long. It's easy to replace it yourself: use a coin to pry open the back cover of the key, being careful not to damage the chip with too much force. The battery slot has +/- markings - just insert the new battery in the same orientation. After replacement, remember to test the lock/unlock functions. If there's no response, it might not be installed properly. You can find these batteries at any supermarket - costs about 10 yuan to fix, much cheaper than going to the 4S shop.

[SanAdalynn]

The Peugeot 408's remote key uses a CR2025 button battery, which is a very common model. When my key stopped working before, I checked the manual—the battery compartment is on the back of the key, with a small groove that can be pried open with a fingernail. When buying the battery, pay attention to three things: first, make sure it's the standard CR2025 model and don't get the wrong one; second, choose a reputable brand like Panasonic or Sony; third, check the production date—the fresher, the better. When installing, handle it gently and avoid bending the metal contacts. Actually, these batteries have a long lifespan, typically lasting over two years. If you replace it yourself, the cost is less than ten yuan, which is much cheaper than the dealership's quote.

[LaPaul]

The Peugeot 408 key fob battery is CR2025. It's best to verify this with your own car key, as the battery type may vary by model year. You can check the battery model by opening the key fob's back cover - the battery has clear stamped markings on its surface. We recommend using original specification batteries, as generic brands may reduce remote control range. For those with DIY skills, replacement is simple: locate the small notch on the key edge and gently pry it open with a flathead screwdriver. The whole process takes less than two minutes, but be careful not to lose the internal transponder chip. After replacement, test all button functions thoroughly.

[DiMolly]

I've personally replaced the key batteries for both of our 408s. The confirmed battery model is CR2025, a 3V coin cell. My DIY replacement experience: First, buying a 5-pack online is more cost-effective, and purchasing a kit with removal tools makes it easier. Lay a towel on the table during operation to prevent small parts from falling. After opening the key shell, pay attention to the battery slot structure and gently pry out the old battery. Install the new battery in a dry state, avoiding direct finger contact with the metal surface. After replacement, wipe the key shell with alcohol swabs to improve button contact sensitivity.

[SiennaDella]

As a former owner of three Peugeot vehicles, I can responsibly inform you that the 408's key fob battery is a CR2025 model. This battery has a diameter of 20mm and thickness of 2.5mm, available for just a few dollars at electronics stores. I recommend preparing a new battery when the key's indicator light dims, rather than waiting until it completely fails. When disassembling the key, I prefer using a guitar pick instead of a screwdriver to avoid scratching the casing. Pay attention to the polarity during installation - the shiny side should face upward. If there's still no response after replacement, it might indicate a motherboard issue requiring inspection. The battery typically lasts two years, though summer heat can slightly reduce its lifespan.