What is the battery model for the BMW 7 Series key?
1 Answers
The battery model for the BMW 7 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 is cylindrical in shape; 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. The rated capacity varies between 200-240mAh, depending on the manufacturer's quality. The shelf life of a CR2032 battery is typically 5 years. However, if the manufacturer's production standards are low or quality control is poor, the lifespan may be significantly reduced. Domestic top-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 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 will notice two slots on the top of the smart key: a deep slot (keyhole) and a shallow slot (for opening the battery cover). Insert the mechanical key into the shallow slot and pry it open to reveal the coin cell battery. Gently remove the old battery. Step 3: Replace the battery. Insert the new battery, reattach the battery cover, and reinsert the mechanical key to complete the replacement. Two important notes when replacing the BMW 7 Series key battery: 1. The key uses a CR2032 coin cell battery—ensure you purchase the correct model. 2. Replace the battery quickly, as the key has a memory function. If power is lost for more than 5 minutes, the key will require reprogramming.
