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How to Replace the Key Fob Battery in a 2018 BMW 330i

How to Replace the Key Fob Battery in a 2018 BMW 330i

Musab Abdelmagid

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If your 2018 BMW 330i key fob has stopped working or has a weak signal, the battery is likely dead. Instead of going to a dealership and paying for a replacement, you can easily swap out the battery yourself in just a few minutes.

This guide will walk you through the step-by-step process of opening the key fob, replacing the battery, and reassembling it correctly. The process is simple, requires only a small flathead screwdriver, and will help you restore full key fob functionality.

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  1. How to Replace the Key Fob Battery in a 2018 BMW 330i, Key Fob Battery: crwdns2935265:01crwdnd2935265:01crwdnd2935265:02crwdne2935265:0 How to Replace the Key Fob Battery in a 2018 BMW 330i, Key Fob Battery: crwdns2935265:01crwdnd2935265:02crwdnd2935265:02crwdne2935265:0
    • Press the small button on the back of the key fob to release the mechanical key.

    • Pull the key out completely.

  2. How to Replace the Key Fob Battery in a 2018 BMW 330i: crwdns2935265:02crwdnd2935265:01crwdnd2935265:01crwdne2935265:0
    • Insert the mechanical key into the slot and gently twist it to pry open the key fob case.

    • Be careful not to use excessive force, as this may damage the plastic casing.

  3. How to Replace the Key Fob Battery in a 2018 BMW 330i: crwdns2935265:03crwdnd2935265:01crwdnd2935265:02crwdne2935265:0 How to Replace the Key Fob Battery in a 2018 BMW 330i: crwdns2935265:03crwdnd2935265:02crwdnd2935265:02crwdne2935265:0
    • Once the key fob is open, you will see the CR2450 battery inside. Make a note of its positive (+) and negative (-) orientation.

    • Carefully remove the old CR2450 battery by lifting it out with a nylon spudger or your fingernail.

    • Avoid using sharp metal tools to prevent damage to the battery compartment.

  4. How to Replace the Key Fob Battery in a 2018 BMW 330i: crwdns2935265:04crwdnd2935265:01crwdnd2935265:03crwdne2935265:0 How to Replace the Key Fob Battery in a 2018 BMW 330i: crwdns2935265:04crwdnd2935265:02crwdnd2935265:03crwdne2935265:0 How to Replace the Key Fob Battery in a 2018 BMW 330i: crwdns2935265:04crwdnd2935265:03crwdnd2935265:03crwdne2935265:0
    • Place the new CR2450 battery in the correct orientation, with the positive (+) side facing up.

    • Ensure the battery is properly seated in the battery slot.

    • Double-check that the battery is positioned correctly before closing the key fob.

  5. How to Replace the Key Fob Battery in a 2018 BMW 330i: crwdns2935265:05crwdnd2935265:01crwdnd2935265:01crwdne2935265:0
    • Align the two halves of the key fob and press them firmly together until you hear a click.

    • Ensure all edges are securely snapped back into place.

  6. How to Replace the Key Fob Battery in a 2018 BMW 330i: crwdns2935265:06crwdnd2935265:01crwdnd2935265:01crwdne2935265:0
    • Slide the mechanical key back into the key fob until it locks into place.

    • Press the lock/unlock buttons to ensure the key fob is working.

    • If the key fob does not respond, recheck the battery installation to ensure it is properly seated.

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To reassemble your device, follow these instructions in reverse order.

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Musab Abdelmagid

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