A laptop on mains power that refuses to charge is usually a cable, a port or a firmware decision. The battery is the last suspect, not the first.
Test a **known-good charger** first, check the **port for debris and play**, then read the battery's **charge limit and firmware state**. Many laptops deliberately stop at 80 percent.
The battery report shows the charge level, the design capacity and whether the machine sees mains power. A laptop that reports plugged in but not charging is a different fault from one that sees no power at all.
powercfg /batteryreportUse a charger with the same voltage and at least the same wattage. Underpowered USB-C supplies can run the machine and still refuse to charge the battery.
Lint in a USB-C port is common and stops the data pins from negotiating power. Look with a torch and remove debris with a wooden toothpick, never with metal.
Battery care modes cap the charge at 60 or 80 percent and report it as not charging. The setting lives in the vendor tool or in the firmware, and it is the most common false alarm on a new laptop.
Many laptops have a pinhole or a key combination that resets the embedded controller. It clears a stuck charge state without touching your data or the battery.
Hold the power button 15 s with the charger removedA battery that charges to 40 percent and stops, or one that reports a design capacity far above its full charge, is worn out. Check the wear percentage before you order a replacement.
powercfg /batteryreport > battery.htmlFirmware or a driver power-management setting. Update the firmware and the chipset driver, then retest.
The port or the internal charging board. Try the other USB-C port before opening anything.
Battery care mode. Turn it off in the vendor tool if you need the full battery.
A worn cell and a confused gauge. Recalibrate by charging full and discharging to shutdown once.
USB-C negotiates, so a lower wattage is safe but slow. A barrel plug with the wrong voltage is not.
Yes. Stop charging, stop using the machine and have it replaced.
Turn the charge limit back on if you disabled it, and remove the battery report file. No setting was changed permanently by the diagnosis.
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