laptop disconnecting power when fully charged

Nick

New member
hey fellas

i got this acer with a weird issue, it works fine with both charger and battery, but when the battery is fully charged it switches on battery power, screen goes darker and it doesn't take power from the psu. once the battery drops to 99% it reconnect the charger, charge up to 100% disconnect the power and so on. basically having a flashing screen once per minute and the sound of the charger plugged in and plugged off. tried to update the bios but nothing changed. where should i look?
 
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