Battery usage charts let you see your battery level over the last 24 hours or for the last 10 days, plus you can see which apps have used the most battery life.
Internet is full of reviews on how awesome is battery life of M1 Macbook. Few even said they are getting 15 - 20 hours of battery life. I have base model ( 8 GB M1 Macbook Air ). I am pretty light user. I use only Chrome ( M1 optimized ) and nothing else. No gaming, no heavy software nothing. I get around ~8 hours of battery life with full charge.As your battery ages, it will lose capacity as part of the normal aging process. Modern MacBook batteries are good for 1000 cycles before needing to be replaced, while older models typically withstand 300 cycles. You can see how your battery is affected by usage using the graphs under System Settings > Battery.
The battery on a MacBook Air 2010 and later is designed to hold 80% of its charge up to 1,000 cycles before it starts to significantly decline. It may take seven or more years for a light Air user to reach 1,000 cycles, while that same cycle count for a heavy user could be reached in two or three years.