First, pull out the key and pry it open to replace the battery, paying attention to the positive and negative poles during installation. Detailed steps for replacing the battery in a BYD key are as follows: 1. Purchase a button battery of the same model as the remote key and prepare a small flat-head screwdriver. The screwdriver should not be too large, as it needs to fit into the key's interface for repeated and careful prying. 2. Remove the key. The opening is usually located at the bottom of the key where a keychain can be attached. Use the flat-head screwdriver to gently pry up and down at this spot until a gap appears. Apply even force to widen the gap until it can be opened by hand. 3. After opening the key cover, remove the battery directly, noting the positive and negative sides, which are usually clearly marked. You can use a needle or small tweezers to lift it out. 4. Once the old battery is removed, insert the new battery following the correct polarity. After installation, do not immediately reassemble the key. Press the button on the front of the key to check if the indicator light flashes normally, confirming the battery is properly installed. 5. Once everything is working correctly, press the disassembled parts back together to restore the key's original appearance. Be careful not to misalign the waterproof gasket at the interface. Observe carefully and press firmly into place.
