Laptops are designed to work better with a battery. While there are some short-lived advantages of using a laptop on AC power instead of DC power, in the long run, the disadvantages of using a laptop without a battery outrun its advantages.
The reason why many people want to use the laptop on AC power while removing the battery is that they want to gain maximum electric supply to power up the laptop and its components. Also, it helps them to save their charged battery as a backup to be used when there is no AC power supply (such as in case of load shedding, traveling, etc.).
However, using a laptop directly on AC power by removing the battery can lead to several disadvantages for your laptop. Some of the most prominent cons of removing the battery and plugging the laptop directly into AC power are as follows:
Loss of data: When you use the laptop without a battery then it means that the laptop will turn off once the power supply cuts off as there is no battery to give power to your laptop in the absence of AC power. This implies that in case of power failure or electric shutdown, the laptop will turn off without giving you a chance to save your data. So, if you are working on something important and you haven’t had a chance to save your files then you will lose all data.
System instability: Interruptions to the system could cause instability or corruption of crucial system files.
Reduced performance: Some laptop models may have settings that reduce system performance if there is no battery present.