How to Replace the Battery in an Older BMW Key?

[AdrielLee]

Steps to replace the battery in an older BMW key: 1. Remove the hidden mechanical key from the remote by pressing the switch to release it; 2. Use the extracted mechanical key to insert into the corresponding slot, then leverage it to lift the key casing; 3. Once the casing is open, gently pry out the old battery from the side gaps using any tool, replace it with a new one, and snap the back cover back on. BMW's main series models include the 1, 2, 3, 4, 5, 6, 7, and 8 Series. Taking the BMW 3 Series as an example, its body dimensions are 4734mm in length, 1811mm in width, and 1455mm in height.