Precautions 
If the standby time of the notebook computer battery is relatively short (less than 30 minutes), the internal battery core is aging. You need to replace the battery pack to solve this problem. There are the following points to note when replacing batteries. 
(1) If more than half of the batteries in the battery are damaged, it is best to replace them all. Otherwise, the newly replaced batteries will be quickly affected by several other batteries that will be damaged. (2) It is best to replace the batteries with the same brand. Do not combine several brands of batteries together. This will affect the overall life span. Even if the batteries of a unified brand are tested, their internal resistance should be tested. A cell that is as close as possible to its performance. (2) During the process of changing the battery, if there is no spot welding machine, it may be necessary to use electric iron welding. At this time, it is necessary to pay attention to the welding time not to be too long. It is not possible to weld several times at one welding time, but each welding time is short. (4) Since the circuit board for protecting the battery core has a self-locking function, it is best to use an external power supply that is the same as the battery voltage when changing the battery core to prevent the circuit board from being powered off and locked. (5) The positive and negative poles of the battery cannot be connected wrongly, and the insulation between adjacent cells must be done well. 
The steps to calibrate the battery are as follows: 
First, plug in the power adapter. 
Second, restart the computer. When the startup screen appears, press the F2 key to enter the BIOS program. 
Third, in the BIOS program, select the Exit item and select the BatteryAuto-Learning option. 
Fourth, press Enter to select the Battery Auto-Learning option (the “√” sign will appear before it). 
Fifth, select the Save and Exit option in the Exit project to save the settings and exit the BIOS program. 
Sixth, the system restarts and battery calibration begins.