What could be the reason for a car key running out of battery just a few days after replacement?

[FinleyFitz]

If the battery quality is not an issue, then the problem lies with the car key itself. Here are the relevant details: Introduction to Car Smart Keys: A car smart key is a common keyless entry system, also known as an intelligent key system. It consists of a transmitter, a remote central locking control module, a driving authorization system control module (three receivers), and related wiring harnesses that form the control system. The remote and transmitter are integrated into the car key, allowing the vehicle to enter a locked or unlocked state based on signals from the smart key, and can even automatically close windows and sunroofs. Types of Car Keys: Pure mechanical lock keys, electronic anti-theft lock keys, and chip-based digital anti-theft lock keys.