Surprising Early Battery Drop on My MacBook Air M3

I’m quite surprised that my MacBook battery has lost 7% of its capacity in just 9 months, even though I’ve been very careful with its usage. My cycle count is only 77, which is still very low compared to the recommended 1000 cycles, and I’ve consistently maintained healthy charging habits, like keeping the battery between 20–80% and avoiding overcharging. I already uploaded a question about this, but I’m still confused why the battery has degraded this quickly despite all the precautions. It’s a bit worrying because I expected the battery to maintain over 90% for at least a year or more. I’m also curious if anyone else is facing the same issue on a MacBook Air M3—it would be reassuring to know if this is normal behavior or if something might be affecting the battery health.