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If you need to replace the battery in your key fob for your 2013 Acura RDX, you'll need to get a CR2032 battery and a flathead screwdriver. You can buy these small round batteries at most stores that sell batteries or have it done at the dealership, but you'll have to pay for a simple task. There is a small hole on the bottom of the key fob where you can insert the screwdriver's tip and gently twist to open the device. Remove the old battery, place the new one facing up, close the device, and you're finished. Instructions may vary slightly depending on whether you have the flip key fob or the silver-sided one. After replacing the battery, you may need to program the key fob, which you can learn how to do in your manual or online.
The key fob for your 2013 Acura RDX operates with a CR2032 battery.