What is the battery model for the Mazda Atenza remote key?

[DelBeckett]

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 if it is square; 20 indicates that the battery diameter is 20mm; 25 represents the battery height of 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 not high or quality control is poor, the lifespan can be significantly shortened. Domestic first-tier brand batteries can generally guarantee this lifespan. Under ideal conditions (sealed, room temperature, no moisture, etc.), the lifespan can be extended further, up to 8 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 lifespan will be. If the remote key battery runs out, the mechanical key can be used directly 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, owners can refer to the battery model in the user manual for replacement. Button-type CR2016 battery: This is one of the most commonly used remote key batteries, with a battery voltage of 3V. Generally, car key batteries are powered by 9V, so all three batteries need to be replaced each time. Examples include Honda, Toyota, Volkswagen, Mazda, etc. CR2016 specifications: battery diameter of 20mm, thickness of 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 CR2016 but has a relatively higher storage capacity. CR2025 specifications: battery diameter of 20mm, 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 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, it is thicker and larger, with a diameter of 24.5mm and a height of 5.0mm. The rated current value for CR2450 is 0.2mA, mainly used in low-power electronic products. Generally, such batteries 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.

[OEsther]

I've been driving the Atenza for several years, and once the key suddenly stopped working. I opened it myself to check the battery type, which is the small CR2025 button battery. This type of battery can be easily found in electronics stores or supermarkets—it's cheap and simple to replace. When replacing it, just gently pry open the key casing with a tool, being careful not to use too much force to avoid damage. Remove the old battery and replace it with a new CR2025, making sure the positive and negative sides are aligned correctly. Over time, the battery in the key will drain faster—like mine, which needs replacement every two years. Otherwise, the remote range shortens, and sometimes the car door won't even open. This battery model is standard for Mazda, and almost all Atenza models across different years use it. If unsure, I recommend checking the owner's manual or consulting a dealership before using any other battery type. After replacing the battery, the key will function normally again, making driving more convenient and safer. Remember to check the battery life regularly—don't wait until it fails on the road. It's a small thing but can cause big problems.