MacBook Air M1 battery drains quicker than expected
I bought a brand new MacBook air m1 two months ago and it currently is running big sur 11.3. Whenever watching a youtube video on safari, my MacBook air's battery drains a bit quickly. When watching a 20-minute video, 1080p, 100% brightness, full-screen, with only discord, Microsoft OneNote, and no tabs in safari open, my battery went down from 59% to 52%. I this normal or should I be concerned?
MacBook Air 13″, macOS 11.3