What is the battery model for BMW keys?

1 Answers
IsabelleAnn
07/29/25 8:02pm
BMW key battery model is CR2450. Basic principle of BMW remote key: The key emits weak radio waves, which are received by the car antenna. The electronic control unit (ECU) identifies the signal code, and then the system's actuator (motor or electromagnetic coil) performs the lock/unlock action. This system mainly consists of two parts: transmitter and receiver. Steps to replace a dead key battery: Flip the key to its back side, locate and press a small button; pull the key handle upward to remove it, revealing the metal mechanical key; use this mechanical key to pry open the key cover - once a gap appears, apply slight force to open it; remove the old battery and replace it with a new one; reassemble the key cover and reinsert the mechanical key to complete the replacement.
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