Why has battery capacity suddlenly dropped?

Microsoft Windows

Microsoft Windows

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On my ASUS ZenBook laptop, battery problems developed last week:the laptop will only run off the chargerwhen the charger is removed, the laptop stops working instantly.light by charger port normally not on at all, whereas used to show red when battery was being charged.ASUS utility suggests that the battery is 100% chargedbattery seemingly never charges: it shows 83% charged yet the battery capacity is at c.4200 mWh via the battery test facility, original 68 000 MWh when newso, it seems that the battery has failed. Is there any software tweak that could help eg. update BIOS?

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