How to Replace the Key Battery for Sonata 8?
2 Answers
Method for replacing the Sonata 8 key battery: 1. Flip to the tail end of the key, where there is a push button. Push it upwards, and the internal metal key will pop out. At this point, you can pull out the key. 2. Next, look at the tail end of the key to find a gap. Use a tool to assist in prying it open with slight force, and the outer shell of the key can be opened. 3. After opening the shell, the key is positioned relatively deep inside. Use a thin object to slide in from the side gap and pry upwards to remove the old battery, then replace it with a new one. 4. After replacing the new battery, be sure to check it, ensuring the positive side faces upwards. 5. Once the battery is confirmed to be properly installed, insert the shell back into place and close it, then reinsert the mechanical key.
I've replaced the Sonata 8 remote key battery many times, and doing it yourself is really simple. First, you need to prepare a new battery, usually a CR2032 coin cell, which can be bought at supermarkets or auto shops for just a few bucks. Then, locate the small gap along the edge of the key and gently pry open the casing using a coin or a small screwdriver—don’t force it too hard to avoid scratching the plastic. When removing the old battery, pay attention to the positive and negative terminal positions, and insert the new battery in the same orientation, ensuring it fits snugly. Reassemble the casing until you hear a click, then test the remote locking and starting functions for responsiveness. Typically, a key battery lasts about a year before the signal weakens, so replace it in advance to avoid issues at critical moments. I check mine roughly every six months—it’s low-cost and prevents hassle. The whole process takes at most five minutes, and making it a habit is super convenient.
