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What is the battery model for the new BMW 3 Series remote key?

1 Answers

GageLee

07/29/25 4:32pm

The battery model for the BMW 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, F would be used instead. 20 - Indicates the battery diameter is 20mm. 32 - Represents the battery height of 3.2mm. The nominal voltage is 3.0V, with an endpoint voltage of 2.0V, and the rated capacity ranges from 200-240mAh, varying by manufacturer. The shelf life of a CR2032 is typically 5 years. However, if the manufacturer's production standards are low or quality control is poor, the lifespan can be significantly shorter. Domestic top-tier brands 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 BMW 3 Series key battery involves just three steps: Step 1: Remove the mechanical key. Press the latch on the side of the smart key to release the mechanical key. Step 2: Open the battery cover. After removing the mechanical key, you'll notice 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 gently to reveal the coin battery. The battery can then be easily removed. 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 CR2032 coin battery—ensure you purchase the correct model. Replace the battery quickly, as the key has a memory function. If power is lost for more than 5 minutes, the key will need to be reprogrammed.

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