Sudden fall in battery percentage!

I use my laptop which is quite new, i.e. 8 months Brand new HP ProBook 450 G8…

But all of sudden, battery drops from 80% to 0% and gives a warning of “going to sleep in 60 secs”… Is this a sofware issue or a battery issue???

Now battery is not going down from 90%… WTH is going on with my PC???

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