How to Replace the Battery in a Sonata 8 Key?

[Jim]

After opening the key shell, you can see the battery. Remove the old battery and install the new one correctly. The method to replace the battery in a Sonata 8 key is as follows: 1. Turn to the tail of the key, where there is a push button. Push it upwards, and the metal key inside will pop out. Then, pull out the key. Next, look for a gap at the tail of the key. You can use a tool to assist in prying it open slightly, and the key shell can be opened. 2. After opening the shell, the key may be positioned deep inside and difficult to remove. In this case, you can slide along the side gap and pry upwards to take out the old battery, then replace it with a new one. After replacing the battery, be sure to check that the positive side is facing upwards. Once the battery is securely installed, insert the shell back and cover it, then insert the mechanical key back in.

[LeKaleb]

I've been driving my Sonata 8 for several years and have replaced the key battery myself a few times—it's quite simple. There's usually a small cross-head screw on the back of the key. Use a flat-head screwdriver to unscrew it, then gently pry open the plastic casing. The battery is a CR2032 coin type—just pop out the old one and insert the new one, making sure the positive side faces up (don’t reverse it). Once, I was in a hurry and applied too much force, cracking the casing. Later, I learned to take it slow to avoid damaging the clips. After replacing, snap the casing back on and tighten the screw, then test the lock function by pressing the remote button. If it still doesn’t work, the internal contacts might be rusty or there could be a circuit issue—just inspect and clean them. The whole process can be done at home, saving a trip to the repair shop.

[LaNorah]

As a beginner, don't be afraid to change the battery for your Sonata 8 key fob - it's quite simple. The key can be separated into two parts by gently prying open from the gap using your fingernail or a small tool, taking care not to force it. Locate the old CR2032 battery inside, remove it, and replace it with a new one, ensuring the positive side faces outward. Snap the case back together until you hear a click sound, then test the remote by pressing buttons to check the car's response. When the key fob battery is low, a warning light will appear on the dashboard - it's wise to prepare spare batteries in advance to avoid emergencies. You can easily purchase these batteries for just a few dollars online or at supermarkets, and the whole process takes only minutes. All you need are simple tools like a small screwdriver and a clean cloth to prevent scratches.

[DeMarcus]

The Sonata 8 key commonly uses a CR2032 battery. When replacing the battery, first check the key's structure. The key shell is secured with clips or screws. After disassembly, use tweezers to remove the old battery and install the new one with the positive pole facing outward to ensure proper current flow. Avoid contact with water or debris as the key contains an electronic chip. After reassembly, test the key's sensitivity. If the key fails, check for contact corrosion or shell tightness to ensure energy efficiency. DIY replacement is cost-effective, simple, and suitable for routine maintenance.