How to Replace the Battery in a Sonata 8 Car Key?

[DallasFitz]

Here is the method to replace the battery in a Sonata 8 car key: 1. Flip to the tail of the key, where there is a push button. Push it upwards, and the metal key inside will pop out. At this point, you can pull out the key. 2. There is a gap at the tail of the key. Find a tool that can assist in prying, and with a little force, pry it open to reveal the outer shell of the key. 3. After opening the shell, the battery is located quite deep inside, and you might not be able to remove it easily. In this case, you can use a thin object to reach in from the side gap, pry upwards, and then take out the old battery before replacing it with a new one. 4. After replacing the battery, be sure to check it, ensuring the positive side is facing upwards. 5. Once the battery is confirmed to be installed correctly, insert the shell back into place, cover it, and then reinsert the mechanical key.

[JasonLee]

I just replaced the battery in my Sonata 8 car key a couple of days ago, and it's actually quite simple to do. There's usually a small gap on the key—just use a coin or a bank card to gently pry it open. Be careful not to use too much force to avoid damaging the plastic casing. Once opened, you'll see a small button battery, model CR2032. Before removing the old battery, pay attention to its orientation to avoid mixing up the positive and negative poles—I once got it wrong and wasted my effort. Then, get a new CR2032 battery, put it in, press it firmly, and close the cover. Finally, test the unlock button on the key to see if the light turns on. It's a good idea to buy spare batteries in advance to avoid being caught off guard. In daily use, the battery can last one to two years, saving you dozens of dollars at the dealership. After learning how to do it, it feels really rewarding.

[OMalia]

As someone who frequently works on various cars, I'm quite familiar with the simple task of replacing the Sonata 8's key fob battery. Use a small tool to pry open the shell from the side gap, remove the old battery while noting the polarity of the CR2032 to avoid incorrect installation. Press the new battery firmly in place before closing the cover. Why does it run out of power? Mostly due to frequent button presses or prolonged use. A common mistake is applying too much force when prying, which may damage the casing - beginners are advised to use plastic tools instead of metal ones. If all functions work after replacement, there's no need to visit a professional shop. Additionally, storing the key in a dry place can extend the battery's lifespan.

[DelAthena]

Replacing the Sonata 8 key battery is simple: pry open the gap cover, remove the old CR2032 battery, replace it with a new one, align it properly, and close the cover. A coin works well as a tool, and it only takes a few minutes. I find DIY saves time, hassle, and money, while also offering the fun of hands-on experience. Regular checks can prevent the inconvenience of a dead battery on the road.