Macbook air m1 battery
Hello, i'm using macbook air m1 from past 4 months now and it was working very well, but from last 2 days i'm noticing that my macbook's battery is draining very fast, i'm not doing any video editing or any rendering just watching netflix on safari, but battery is draining very fast. and today i checked battery health and it's 99% now, i don't why battery health drop to 99% as i'm using this macbook from past 4 months. what should i do now, please help me
MacBook Air 13″, macOS 11.3