What is the battery model for the BMW new 3 Series key?
2 Answers
The battery model for the BMW new 3 Series key is CR2032. CR2032 is a lithium manganese dioxide battery, named according to the IEC standard. The breakdown is as follows: C - Indicates a chemical battery system with lithium metal as the negative electrode and manganese dioxide as the positive electrode. R - Indicates the battery shape is cylindrical; if it were square, it would be denoted by F. 20 - Indicates the battery diameter is 20mm. 32 - Represents the battery height of 3.2mm. The nominal voltage is 3.0V, the endpoint voltage is 2.0V, and the rated capacity varies between 200-240mAh, depending on the manufacturer's quality. The shelf life of CR2032 is typically 5 years. However, if the manufacturing quality is poor or quality control is inadequate, the lifespan can be significantly shorter. Domestic first-tier brands can generally guarantee this lifespan. Under ideal conditions (sealed, room temperature, no moisture, etc.), the lifespan can extend to 8 years or even 10 years. BMW models such as the 3 Series, 5 Series, and 7 Series all use the CR2032 battery for their keys. Replacing the key battery involves just three steps: Step 1: Remove the mechanical key. Press the lock button on the side of the smart key to release the mechanical key. Step 2: Open the battery cover. After removing the mechanical key, you will see a deep slot and a shallow slot at the top of the smart key. The deep slot is for the keyhole, while the shallow slot is used to open the battery cover. Insert the mechanical key into the shallow slot and pry it open to reveal the coin cell battery. Gently remove the battery. Step 3: Replace the battery. Insert the new battery, reattach the battery cover, and then the mechanical key. The battery replacement is now complete. Two important notes when replacing the BMW 3 Series key battery: The key uses a coin cell battery, model CR2032. Do not purchase the wrong type. Replace the battery quickly because the key has a memory function. If power is lost for more than 5 minutes, the key will need to be reprogrammed.
I still remember the last time I replaced the battery for my BMW new 3 Series key. The model was CR2032, a common coin cell battery that’s widely available in most electronics stores and costs just a few bucks. Before replacing it, pay attention to signs of a low battery, like reduced remote locking distance or unresponsive buttons. It’s a simple DIY job—just use a small screwdriver or coin to pry open the key casing, remove the old battery (the CR2032 label is on the battery itself), and make sure to install the new one with the correct polarity to avoid a short circuit. After I replaced mine, it worked fine again. Generally, you should replace it every 2 years to prevent battery leakage from damaging the key’s internal circuits. Remember to avoid static electricity and keep it dry during the process, as moisture can affect the remote function. If the key malfunctions after replacement, you’ll need to visit the dealership for reprogramming. Regular maintenance like this can save a lot of hassle—now I always keep a few CR2032 batteries at home.
