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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 a new battery. It's easy to replace the battery yourself. The battery can be replaced by simply removing the access port from the valet key. After that, you need to make sure that the new battery is registered. How to Replace the Battery A car battery is the most important element of a car and will have to be replaced at least once during a driver's life. However replacing the BMW battery does not have to be the most complicated DIY task, and you could even save money by performing it yourself. Knowing how much work is needed to replace batteries is essential to success with your DIY project. It is important to be aware of the type of battery that your BMW uses. There are three types of batteries, each with its own pros and cons. One of the most popular is a lead-acid battery, which is composed of sulfuric acid and lead. It produces electricity by a chemical reaction and then recharges itself using your BMW. Other battery types that are used in BMWs are Gel or Absorbent Glass Mat (AGM). These batteries operate similarly but require different installation and handling. Once you've got a good idea of which battery your BMW uses then it's time to replace the battery that was in use. Most auto parts retailers will have systems in place to match your BMW's make and model with the right battery, which could save you some time. You can also look up your owner's guide which will include the type of battery needed for your specific model. To replace the battery in the BMW key fob, switch off your vehicle and remove the metal blade of the valet key, or a flat screwdriver to access the lock cylinder. Then, remove the fob's liner, and locate the battery. After removing the battery clean the terminal connections, and then reinstall them using careful. Be sure not to tighten the brackets too tightly and this could cause cracks in the battery case. Connect the positive terminal before the negative terminal. Then, connect the upholstery to its normal position. Registering your new battery is also a good thing to do. 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 brand new BMW battery. How do you replace the CR2032 Battery A lost key fob can be an inconvenience, but it's also quite simple to replace the battery. It takes only minutes and can be done at home. The key fobs found in BMW vehicles use CR2032 batteries, which are a common watch battery. These batteries are more expensive than others, but they can be purchased at any convenience store or auto parts center. If you've got the new battery, simply remove the old one and put in the new one, and then put the cover back on. It's a quick process, and you'll be able to restart your vehicle in no time. If you've been driving your BMW around the Johns Creek area, and you suddenly realize that your key fob won't work It's most likely due to an unresponsive battery. It's easy to fix. Press the small tab on the left side of the BMW key fob to open the valet key. You'll notice an unassuming port next to the battery after the key fob has been opened. You can make use of a flat screwdriver or similar tool to remove the battery cover, then you can replace it with a new one. If you're in market for a new BMW, or you want to buy a used car available near Decatur Make sure to browse our inventory at Tulley BMW of Nashua! If you have any questions regarding our vehicles, don't hesitate to contact us today. We look forward to helping find the perfect vehicle for you! How to Replace a CR2450 battery The BMW key fob is a convenient device that provides security and convenience with the click of the button. Over time, however the battery in your BMW key fob will weaken, and it will require replacement in order for it to continue working properly. Knowing how to replace a BMW key fob battery will allow you to get back on the road quickly and easily. Although there are a variety of types of BMW key fobs however, they all use the same battery type such as CR2450 or the CR2032 coin cell battery. The small round battery can be found in most shops for less than $1 per unit. CR2450 batteries are easily installed and removed from the key fob. To replace the CR2450 battery in your BMW first, look for the tab on the key fob which opens the valet key made of metal inside the fob. Once the metal valet is removed, locate the tiny access port that conceals the key battery on the front of your fob. Remove the cover with a flat-headed screwdriver, revealing the battery. Install a new battery with the positive side facing upwards and then reassemble the key fob. Test the key fob after the battery is replaced to confirm that it's working as intended. If the key fob does not respond, contact your BMW dealership for further troubleshooting assistance. Certain older BMW models require that the key fob be synchronized with the vehicle after replacing the battery. However, this is not the case for BMWs made in recent years. While it is possible to change the battery on an older BMW key fob by cutting open the case and putting to a new battery, this procedure is not recommended since it could cause damage to the internal circuit board. Instead, The Keylab of Nashua recommends following the instructions in this article to change the CR2450 battery for most BMW key fobs. This simple task can take only a few minutes to return you to the road. How do I replace the CR2032 Side Indent Battery The CR2032 side indent battery in the BMW series 1 key fob (and some other models) is easy to replace. This battery appears like a penny and slides into the slot easily. Use your fingers to remove the old battery, then replace it with a new one, being sure to match the reverse. You can find replacement batteries in many auto parts stores, as well as online. If your BMW has diamond key fobs, the process is slightly more difficult. The CR2016 battery inside the key is not identical to a CR2032 or a CR2025 however, and you are unable to open the case to replace it. You can check if it works by shimming a CR2016 with some aluminum foil that conducts electricity. If it fails to work, you will have to cut off the fob plastic piece to expose the battery, and then put in the new one. The tiny access port found on many BMW key fobs can be opened using the edge of another key's metal blade or a screwdriver that is flat. If you don't have an edged metal blade, you can use the tip of a pen. After you have removed the cover and then open the cover, the CR2032 batteries will be visible. The CR2032 side-indent battery was not intended to be serviced, and the case is not opened. This battery is rechargeable, and charges when you insert the ignition key. It's a good idea have a spare key in case your remote gets broken or lost. Contact us at Tulley BMW Nashua if you require assistance programming your BMW remote, or replacing a dead phone. We have a team of committed experts who can help you with any questions or concerns. We are eager to hear from you!