The Honda Civic key fob screw size is m2-0.4. All key fobs use the same type of battery, which is a cr2032 battery. These are small coin-shaped batteries and they will cost You about 5 dollars each on average. You can find them in the same place You would normal batteries. To change the battery You will need to remove the back panel of the fob. Some fobs are different than others. You may be able to simply pull down on the back and have the piece slide off. If so then You can simply remove the old battery and put the new one in its place. However, You may need to remove a couple of tiny screws before You can do this. They are not hard to get out, as long as You have a small enough screwdriver on hand.
Mary T
July 30, 2020
The Honda Civic key fob screw size is M2-0.4.
Brian
July 27, 2023
Not all remotes use a cr2032. It's important to check the battery before discarding it to ensure you replace it with the correct one. Using The wrong battery can result in the fob not working or even breaking part of the case. Making a simple dead battery become a re-shell or or a full replacement. Battery size can range from cr1616 all the way to a cr2450.
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