Laptop (Win 11) powers on only plugged in

My laptop only powers on when it is connected to the AC adapter, but as soon as I unplug the charger, the system immediately shuts down, even though the battery icon sometimes shows a remaining charge. I have already tried recalibrating the battery, checking power settings, and updating the BIOS, but the issue persists, so I am wondering if this is a failing battery, a faulty charging circuit, or a software problem that can be resolved without replacing the hardware.