What is the battery model for the 2019 Sagitar car key?
2 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, if it is square, F is used instead; 20 indicates the battery diameter is 20mm; 25 represents the battery height is 2.5mm. The nominal voltage is 3.0V, the endpoint voltage is 2.0V, and the rated capacity ranges from 140-170mAh. CR2025 typically has a lifespan of 5 years. If the manufacturer's production level is low or quality control is poor, its lifespan will be significantly shortened. Domestic first-tier brand batteries can generally guarantee this lifespan. Under ideal usage conditions (sealed, room temperature, no moisture interference, etc.), the lifespan can be further extended to 8 years or even 10 years. The usage time of the 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, the mechanical key can be used directly to unlock 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 battery voltage is 3V, and generally, 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 is 20mm, thickness is 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 is 20mm, thickness is 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, making the thickness 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. It is shaped like a button, hence the name button lithium battery or lithium manganese button battery.
The battery model for the 19th-generation Sagitar car key is usually CR2032, a small button cell that is readily available at convenience stores and online. I've replaced it several times myself. Just note that there's a small groove on the back of the key—using a coin to twist it open will reveal the battery compartment. The original battery is marked with "CR2032." When installing a new battery, make sure the positive side (the one with the + sign) faces upward and aligns with the metal contact. Once, I installed it backward, and the key stopped working immediately—it was quite a scramble. This type of battery lasts over a year, and faster drain in cold weather is normal. It's safest to keep a spare battery in the car. Avoid scratching the plastic clips with metal tools during removal. If the key light turns on after reassembly, you've succeeded.
