How to Replace the Battery in a BMW 5 Series Key?
2 Answers
To replace the battery in a BMW 5 Series key, follow these steps: 1. Press the switch on the back of the key to remove the mechanical key. 2. Use the mechanical key to open the key cover by inserting it into the slot next to the key and gently prying it open. 3. Once the key cover is open, the old battery will be visible. 4. Use a small flat-head screwdriver to remove the depleted battery. 5. Insert the new battery, ensuring the "+" side faces upward. 6. After installing the battery, reassemble the key. 7. Test the key's lock button and other functions to ensure they work properly. Here are some important notes: 1. Improper battery replacement may damage the car key. 2. Before replacing the battery, check the battery model. When purchasing a new battery, pay attention to its voltage, size, and specifications. 3. If you are unsure about replacing the battery, you can visit a 4S store for assistance. 4. Avoid using the key outside its operational range, as excessive use beyond this range may cause the key to malfunction. 5. Exposure to strong magnetic fields can lead to electronic key failure. 6. Excessive moisture on your hands may cause the key to rust or even short-circuit.
I've changed the battery in my BMW 5 Series key several times myself, and it's really quite simple. There's a small gap on the back or side of the key—just use a flat tool like a coin or a mini screwdriver to gently pry it open, being careful not to scratch the casing. Once open, you'll see the old battery. Pay attention to the polarity markings—it's usually a CR2032 coin cell with the positive side facing outward, so note that to avoid installing the new battery backwards. You can find the new battery at any supermarket for a few bucks. Insert it, ensuring good contact, then press the casing back together until you hear a click. Don't forget to test the remote functions afterward, like checking if the lock button responds promptly. If the buttons don't work, the battery might not be seated properly—just reopen and check. This DIY method saves you a trip to the dealership and unnecessary expenses, taking only about ten minutes while ensuring long-lasting key performance. Remember to check the battery life during routine maintenance to avoid being caught off guard when it dies—after all, driving safety comes first.
