How to Replace the Battery in an Old BMW 5 Series Key?

[CaydenDella]

The steps to replace the battery in an old BMW 5 Series key are: 1. Turn the key fob over to the back and locate a small button, then press it; 2. Grip the top part of the key and pull it upwards to remove it, revealing the metal mechanical key; 3. Use the extracted mechanical key to pry open the key fob cover. Once a gap appears, apply slight force to fully open it; 4. Remove the old battery and replace it with a new one; 5. Reattach the key fob cover and insert the mechanical key back into place. The BMW 525 model is equipped with a 2.0-liter inline 4-cylinder turbocharged engine, paired with an 8-speed automatic transmission, delivering a maximum power of 135 KW and a maximum torque of 290 Nm.