How to Replace the Key Battery for BMW 320?

[DelValeria]

First, remove the key from the remote control, locate the small square on the key, then take out the old battery and install the new one. Once the battery is depleted, it cannot be recharged. You need to remove this battery and insert a new one with the positive side facing up.

[IrisLynn]

Last time I spent ages helping a colleague replace their BMW key fob battery, but it's actually super simple once you know the trick. First identify your key type: older models have a small notch on the side, while newer ones feature the BMW logo on top. Get a CR2032 battery and thin plastic pry tool - avoid metal tools that might scratch the casing. For older keys: Remove the mechanical key, insert the plastic tool into the side groove and pry horizontally to open, being careful with the small rubber gasket inside. Newer keys are easier - just pop open the BMW logo cover on top. Note the old battery's orientation before inserting the new one the same way; you should hear a 'click' when properly seated. Finally, align and snap the casing shut. Don't forget to test the lock button afterwards! The whole process takes about five minutes - shorter than finishing a bubble tea!