https://www.thekeylab.co.uk/bmw-car-keys/ BMW Battery Replacement - How to Do it Yourself If your BMW keyfob isn't responding to the lock or unlock buttons, or if it isn't working at all it could be time to get an entirely new battery. It's a good thing that it's simple to replace the battery at home. The battery can be replaced by simply taking the access port off the valet key. Then, you must register the replacement battery. How to Replace the Battery A car battery is among the most important parts of any vehicle and will have to be replaced at least once throughout the life of a driver. However, replacing the BMW battery isn't necessarily the most complicated do-it-yourself project, and you can even save some money by doing it yourself. The key to an effective DIY battery replacement is knowing how much work it will take. The first step is to determine the type of battery your BMW utilizes. There are three types of batteries each with its own pros and cons. Lead-acid batteries are the most popular since they are made up of sulfuric acids and lead. It produces electricity through chemical reactions and then recharges itself using the power of your BMW. Other battery types found in BMWs include Gel or Absorbent Glass Mat. These batteries function similarly, but require different handling and installation. Once you've got a clear idea of which battery your BMW has, it's time to replace the battery you've had for a while. Most auto parts retailers will have systems in place to match your BMW's model and model with the right battery, which could help you save time. You can also look up the owner's manual, which should list the battery type needed for your model. To change the battery on a BMW keyfob, turn your vehicle off and then remove the blade made of metal from the valet key. You can also make use of a flat screwdriver or valet keys to open the lock-cylinder. Remove the liner from the fob and locate the battery. After taking the battery off, clean the terminal c