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BMW Battery Replacement - How to Do it Yourself If your BMW keyfob doesn't respond to the lock or unlock buttons, or has stopped working completely it could be time to get a new battery. It's easy to replace the battery yourself. The battery can be replaced by simply taking the access port off the valet key. Then, you must add the new battery to your account. How to replace a battery A car battery is the most crucial component of any car and will need t