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How to Repair a Remote Key Even though most remote key fobs come with an impressive battery life, they will eventually get worn out. Sometimes it's as simple as changing the batteries inside the device but sometimes the issue can be more severe. Take apart the remote and clean the buttons. Then, flex them in and out. These techniques may be all that you need to get your key fob back in working order. Battery If the fob continues to working you can replace the CR2025 or CR2032 battery. If it isn't then you can remove the fob and examine the bat