How do you change the battery in a BMW 328i key fob?

My car remote died, and I don’t have a backup. I need to install a new battery ASAP. How do you replace the key battery in a BMW 3 Series?

Liz Jenson · Updated on
Reviewed by Shannon Martin, Licensed Insurance Agent.
That sounds frustrating! Luckily, it’s pretty easy to change the battery in a
328i key fob. Here’s how to do it:
  • First, press and hold the small button located at the base of your key fob. Doing so will allow you to remove the metal key from your fob.
  • Feel along the edge of the key fob until you locate a small hole. Insert a small flathead screwdriver or use your metal key to pry off the back panel of the key fob.
  • Carefully remove the old battery. Make sure to note where the negative and positive terminals are situated, as you’ll need to orient your new battery the same way.
  • Place your new battery in the key fob. Try not to touch the terminals as you do this since that can decrease the battery life of your key.
  • Finally, replace the back panel. You should feel a click when the two halves are properly attached. Then, you can insert the metal key and test out your new key fob battery!
Since you’re taking some time to change the battery in your car remote, why not take an extra minute to learn more about your car insurance options with the
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