Just after replacing the battery, there was a click when unlocking. Idle speed is also unstable. What happened?

The symptoms are similar to those I once encountered when the driving computer lost dirty throttle data. The computer thinks that the throttle is new, which leads to unstable idle speed. Seriously, it will also cause the engine to stall when the car is cold. This phenomenon can be eliminated by cleaning the throttle, which is a phenomenon and cannot be called a fault. The reason for this phenomenon is that the computer is out of power. Do you remember?