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BMW Battery Replacement – How to Do it Yourself If your BMW key fob isn't responding to your lock and unlock buttons, or has stopped working completely it may need an upgrade to the battery. bmw key replacement 's not difficult to replace the battery at home. You simply need to locate the access port hidden inside the valet key, then remove it, and switch out the battery with a fresh one. Then, you must make sure that the new battery is registered. How do I replace the battery? A car battery is one of the most important parts of any vehicle. It will require replacement at least once in the life of a driver. It's not hard to replace the BMW battery yourself, and you may even save money. Knowing the amount of work necessary to replace batteries is the first step to an effective DIY project. The first step is to determine which type of battery your BMW utilizes. There are three kinds of batteries, each of which has its own pros and cons when in use. Lead-acid batteries are the most common because they contain sulfuric acids and lead. It produces electricity through an chemical reaction, and it recharges itself when you use your BMW. Other battery types used in BMWs are Gel or Absorbent Glass Mat (AGM). These batteries operate similarly however they require different handling and installation. Once you have a clear idea of the battery your BMW is using, it's time to replace the battery you've had for a while. Most auto parts retailers will have systems that match your BMW's make and model with the correct battery, which can save you time. You can also refer to your owner's manual, which should list the battery type needed for your particular model. To replace the battery on a BMW keyfob, turn your vehicle off and remove the metal blade 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 batteries out clean the terminal connectors then carefully reinstall. Don't tighten the brackets too tight, as they could break the battery case. Connect the positive terminal prior to the negative terminal. Finally, reconnect the upholstery to its normal place. It's also a good idea to register your new battery. If you do this the engine control module (known as the DME) will be aware that the battery has been installed and won't get confused about which one to charge. This will also reset the battery's age statistics to avoid charging too much for your new BMW battery. How do you replace a CR2032 battery A lost key fob can be difficult, but fortunately, it's also fairly easy to replace the battery. It takes only a few minutes and can be done at home. BMW key fobs use CR2032 watches batteries. They're more expensive than other types of batteries, but they are easily found at any convenience retailer or parts store. Once you have an entirely new battery, you can simply remove the old one and replace it with the new one, and then put the cover of the fob back on. It's a quick process, and you'll be able to restart your vehicle in the blink of an eye. If you've been driving your BMW around the Johns Creek area, and you realize that your key fob isn't functioning It's most likely due to an unresponsive battery. It's a good thing that it's simple to repair! First, you'll need press the small tab on the side of your BMW key fob to release the valet key inside. There will be a small port near the battery once the key fob is opened. The cover for the battery is removed using an screwdriver with a flat head, or other similar tool. If you're looking for an all-new BMW or a pre-owned car in the vicinity of Decatur Be sure to browse our inventory at Tulley BMW Nashua. Contact us today if you have any questions about our vehicles. We look forward to helping you find the perfect car for your needs! How do I replace the CR2450 Battery The BMW key fob is a vital part of your driving experience. It provides security and convenience at the touch of one button. As time passes the battery inside your BMW keyfob can weaken, and it will require replacement in order for it to work correctly. Knowing how to replace the BMW key fob will assist you in getting back on the road again swiftly and easily. There are a variety of BMW keyfobs. However, they all use the same type of battery, which is a CR2450 coin-cell battery. This small, round battery is available in most stores for less than $1 per unit. In addition to being easily accessible, CR2450 batteries are also very simple to install and remove from the key fob. To replace the CR2450 battery in your BMW first locate the tab on the key fob that opens the valet key made of metal inside the fob. Once the metal valet has been removed, you can locate the small access port that conceals the key battery on the front of your fob. Remove the cover with an open-ended screwdriver to expose the battery. Once the old battery is removed, replace it with a brand new one with the positive side facing upwards and then put it back together. After the new battery has been installed Test the key fob to ensure that it functions in a proper manner. If the key fob fails to respond, consult your BMW dealer for further troubleshooting assistance. Some older BMW models require that the key fob be re-synchronized with the vehicle after changing the battery. However, this is not the case for BMWs made in recent years. It is possible to replace the battery on an old BMW key fob, by opening the case and soldering an alternative one into. However, this method should not be used because it could damage the internal circuitry. Instead Tulley BMW of Nashua recommends following the steps in this article to change the CR2450 battery for most BMW key fobs. This simple task can be accomplished in just a few minutes and can help you get back on the road sooner. How do I replace a CR2032 Side Indent Battery It is simple to replace the CR2032 side-indent battery found in BMW series 1 keyfobs (and other models). This battery is shaped like a nickel and can be removed and put back into the slot easily. Replace the old battery with the new one by using your fingers. Be sure to ensure that the polarity is in line. There are replacement batteries at many auto parts stores, as well as on the internet. If your BMW has diamond key fobs, the process is slightly more difficult. It is not possible to replace the CR2016 battery since it's different from a CR2032, CR2025 or a CR2032. However you can try shifting the CR2016 cell with conductor foil to see if it will work. If it fails to work, you'll have to cut off the fob plastic part to expose the battery and then solder in the new one. The majority of BMW key fobs have a small access port that can be opened with the edge of a blade made of metal from a different key or a flat screwdriver. If you don't own an edged metal blade, you can use the tip of pen. Once you remove the cover, the CR2032 batteries are evident. The CR2032 side-indent battery was not intended to be serviced, and the case can't be opened. The battery is rechargeable and is charged when you insert the ignition key. It's a good idea keep a spare key in the event that your remote is lost or broken. If you need assistance programming your BMW remote or replacing the battery that is dead, contact us at Tulley BMW of Nashua. We have a team of experts available to address your questions or concerns. We look forward getting in touch with you!