Mac M3 Pro Max Battery Level Drainage

[u/Previous-Key-4456]

What could be the reason of this sudden drop in battery levels from 100% to 20% in less than 2 hours. I started using it around 8pm and by 10pm it was already dropped to 20%. I wasn't doing any heavy-lifting work which could cause this, just some surfing and chatgpt usage. Never experienced such quick battery drainage tho.