How to Replace the Key Battery for Hyundai Cars?
2 Answers
To replace the key battery for a Hyundai car, follow these steps: 1. Prepare tools and battery: 1 flathead screwdriver, 1 car key that needs battery replacement, and 1 corresponding battery model. 2. Locate the round button on the side of the car key. Press this button with one hand while pulling out the mechanical key with the other hand. 3. Find the gap in the middle of the top end of the key and insert the flathead screwdriver: Hold the key with one hand and the screwdriver with the other; locate the gap in the middle of the top end of the key and insert the flathead screwdriver; pry the key up and down until a gap is created. If the key doesn't budge, gradually increase the force until it moves. 4. Install the new battery: Remove the key circuit board, gently push one side of the battery with your finger, and take out the old battery. Place the new battery with the positive side facing up into the battery slot, then gently push it until it is fully secured. 5. Reassemble the key: Cover the key circuit board back onto the key, align the two separated halves of the key properly, and press both sides of the key with your hands until the upper and lower parts are completely fitted together. Finally, insert the mechanical key back into the key slot.
I bought a Hyundai Elantra last year, and changing the key battery myself was quite easy. First, look for a small slit or button on the key—mine had a small groove on the side. Gently pry it open with a fingernail or plastic tool (avoid metal tools to prevent scratching the casing). Remove the old battery, which is usually a CR2032, making sure the positive side faces up. You can buy a new battery at the supermarket for just a few dollars. After inserting the new battery, close the cover tightly and test the remote locking function. If it doesn’t work, the battery might not be seated properly—try reinstalling it. Typically, the battery needs replacement every year and a half to avoid running out of power in urgent situations. I also recommend checking the owner’s manual to confirm the battery model, as Hyundai designs vary by model—for example, the 2020 Sonata is even easier to open.
