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Notebook battery discharges when I plugin connector

starLED

Member
I have an older Acer notebook with a battery of 60% capacity health.

When the battery is 20% or less remaining, if I plugin adapter connector without adapter being plugged into wall socket, the battery discharges immediately to 0% and notebook shuts off.

Why is this happening?
Is this potentially dangerous to the notebook?
 
It happens also when the laptop is in sleep mode with 20% battery or less, and after plugin in connector and wakeup it shows 0%, meaning it discharged while not powered on.
 
Your battery likely has unstable voltage due to aging cells. When critically low (20%), plugging in a 'dummy' adapter (not connected to power) confuses the power circuit, triggering immediate shutdown as a safety measure. While not directly dangerous to hardware, repeated sudden shutdowns risk data loss/corruption. Consider replacing the battery or always ensuring the charger is properly powered when connecting.
 
Yes, you are right.
Fortunately, laptop does go into hibernation mode when that happens, so it doesn't shut off abruptly.
I will look for a new battery.
 
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