Some laptop manufacturers provide BMS reset tools. You can search for your specific laptop model and BMS reset tool online.
This works for most modern laptops with sealed (non-removable) batteries.
This is the safest method and is used primarily to fix "ghost" battery percentages where a laptop shuts down even when showing 20-30% charge. Manual Calibration Cycle
: Plug the laptop back in and let it charge for at least 30 minutes before turning it on. Method 2: Software Calibration (The "Soft Reset")
If your laptop has a clip-out battery (common on older models):
Depending on your laptop model and the severity of the issue, you can use several methods ranging from a simple software calibration to a hardware "hard reset."
You might not need a new battery—yet. The culprit could be your laptop’s Battery Management System (BMS) .