How to Replace the Battery in a BMW 3 Series Remote?

[StElena]

There are generally three methods to replace the battery in a BMW 3 Series remote: 1. For very thin remotes with a circle on the back and a groove in the middle, press the lock button, remove the mechanical key, and pry open the cover to reveal the coin battery. Remove the old battery, paying attention to the positive and negative poles, and install the new battery. 2. For remotes without a battery cover on the back and a groove along the seam between the front and back of the remote, use an appropriate tool to unscrew it based on the groove size. This type of key has an integrated rechargeable battery that cannot be replaced. It automatically charges each time it is inserted into the ignition. If the key indicates low battery, the entire key may need to be replaced. 3. For thicker remotes, such as those used in newer 3 Series models, remove the mechanical key. You will see a small hole on the cross-section that fits the mechanical key. Insert the key and pry it outward. Once opened, use your fingernail to separate the parts, revealing the battery panel. Remove the old battery and replace it with a new one.