Why did my battery capacity drop from 27000 mwh to 4300 mwh suddenly?

[Rajat Rawat1]

I have had this laptop for 3 years now. I was working yesterday and my battery percentage was showing around 90%. Suddenly my laptop shut down. I plugged in the charger and saw that battery had drained to zero. I checked the battery health and it shows that my full charge capacity is 4200 mwh. And it was 27000 mwh just few hours ago. It is providing battery backup of around 1 hour 10-20 minutes without charging.

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