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I have an Asus X540LJ laptop. I recently changed the battery: it is properly detected, and is charging if the AC cable is plugged in.

But my problem is: if the laptop is running, by unplugging the AC cable the laptop immediately shuts down; as well as the battery led is blinking orange!

I did a battery reset (by following steps on https://www.drivereasy.com/knowledge/asus-laptop-plugged-in-not-charging-solved/), the problem still persists.

If the AC cable is not plugged in, then I can't power on the laptop (by plugging AC cable in, power-on is possible).

What should I do? The battery is recognised, the driver is recent, the battery reset was done. But still no battery-mode, and the led is blinking orange.

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All the symptoms you described fit a weak battery, i.e. one that cannot provide the current needed by the device.

  • Did you wait long enough to fully charge the battery before using it? This may take a day or more.
  • Did the charge indicator change to green , showing the battery was fully charged? If not, then the charge regulator in the laptop may be faulty, or thew battery may be bad. To check, substitute another battery.
    • If that alternate battery works for some time and then and can be recharged back to 100% in the laptop after use, then it's certain the last battery was bad. Easy fix: change battery.
    • If the substitute battery works for a while, but cannot be recharged in the laptop, then the charging regulator in the laptop is defunct. Harder fix: the laptop would need to be taken apart and repaired.
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  • Oh, no! As you write, it would be the charging regulator or something on the motherboard. Since the "battery-mode" does not work at all, even not for 1 second. It was from the begining so. The battery is recognized, but cannot be used or charged by the laptop. – A.V. Sep 23 '19 at 5:52
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    @A.V., if it never worked, how do you know that it's not a dead battery??? – DrMoishe Pippik Sep 23 '19 at 17:40
  • this battery was tested with another laptop. Therefore! – A.V. Sep 24 '19 at 19:52
  • Then you know that a good battery doesn't work, which shows it is not just the charging system that is broken, but the internal power supply that converts battery voltage to the various bus voltages is broken. – DrMoishe Pippik Sep 25 '19 at 1:52

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