We need a small screwdriver, a car key, a new battery of the same model as yours, and a towel or cloth to protect our precious key.

First of all, gently separate the car keys up and down, just like operating on it. At this time, our screwdriver can come in handy, like a small "scalpel".

Next, we will perform "heart-changing surgery" on the car keys. Carefully take out the old battery, just like taking out the "heart" of the key, then put in the new battery and fix it. Remember to put the new battery away and don't let it run around!

Then, we need to reassemble the car keys. Just like assembling a small toy, carefully align the upper and lower parts to ensure a tight connection.

Finally, let's test the key functions. If everything is all right, your car keys will be revitalized and can be used normally!