What is the battery model for the Mazda 3 key?
4 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 is cylindrical in shape, with F used as a substitute 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 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, the 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 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 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 this battery in car key remotes is very high, making it one of the most common remote battery types. The battery voltage is 3V, while most car key batteries are powered by 9V, so three batteries need to be replaced each time. Examples include Honda, Toyota, Volkswagen, Mazda, etc. CR2016 specifications: battery diameter of 20mm and thickness of 1.6mm. Button-type CR2025 battery: Its usage rate is much lower than that of 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 of 20mm and thickness of 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 stable manganese dioxide, the negative electrode material is lithium metal, and the electrolyte is a lithium battery. The main components of the electrolyte are dimethoxyethane, propylene carbonate, and lithium perchlorate. It is shaped like 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, such batteries can provide an output current ranging from 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.
The battery model for this Mazda 3 (Axela) key is CR2025. As a mechanic, I've encountered many car owners who have experienced key malfunction issues. Most of the time, it's due to aging batteries causing reduced remote control range or unresponsive buttons. In such cases, don't rush to spend unnecessary money at the shop—you can replace it yourself. The specific model is a CR2025 coin cell battery because the Mazda 3's design requires a stable 3-volt output. When removing the battery, use a small screwdriver to gently pry open the gap on the back of the key, but don't apply too much force to avoid damaging the plastic casing. After installing the new battery, make sure the positive side faces outward and is pressed firmly, then test the remote function to ensure it works properly. I recommend checking the battery every two years, especially in northern winters where low temperatures can accelerate power drain—replacing it early saves hassle. Also, avoid keeping your key near your phone, as magnetic interference can affect battery life. Keep a few spare CR2025 batteries at home—they're cheap and convenient.
I've been driving the Mazda3 for several years. Last time, the key suddenly stopped working, which was really annoying—I pressed the unlock button for a long time with no response. Later, I got smarter and learned that the battery model is CR2025, which can be easily purchased at supermarkets or online for just a few bucks. Replacing it yourself is simple: open the back cover of the key, remove the old battery (be careful not to damage the internal circuits), align the new CR2025 battery correctly, and insert it. After replacement, test the unlock and lock functions to ensure they're restored. I recommend paying attention to battery warning signs, like when the remote range drops from over ten meters to just five—it's time for a replacement. Don’t wait until it completely fails and you can’t open the car door, which is even more troublesome. I usually replace the battery every three years or so, opting for reputable brands to avoid leakage and key damage. It’s also a good idea to carry a spare battery just in case.
The Mazda 3 key battery is CR2025, as confirmed in the car's manual. Replacing it yourself is super quick: just pry open the key cover and swap it in. Be careful not to reverse the polarity, and make sure to use CR2025—avoid other models to prevent voltage mismatch and malfunction. After replacement, the button response will be more sensitive. The battery is inexpensive and easy to find. Regular checks can prevent unexpected issues.
