Well the expected life span of a brand new battery is 5 years. I'd say it's quite normal to me. And don't let the number fools you. They're only estimations. A lot of different conditions may affect the aging of a battery: Depleting Heat Physical damage Unsafe charger Don't worry too much about your battery.
The MacBook Air 13 uses a 52.6Wh (watt-hour) lithium polymer battery, while the MacBook Air 15 has a 66.5Wh unit inside.. So what does that extra battery capacity buy you in claimed battery life terms? The 13in model is stated as being good for “up to 18 hours” of battery life.
Buy A1932 A2179 A1965 Battery for MacBook Air 13" Retina (2018 2019, Early 2020) EMC 3184 3302 MRE82 MRE92 MVFH2 MWTJ2 MVH22 MVFM2 MVFK2 MREE2 MREC2 MREA2 MREF2 MUQT2 MUQU2 MacBookAir8,1 8,2 9,1: Batteries - Amazon.com FREE DELIVERY possible on eligible purchasesAccording to iFixIt, the battery capacity for this MacBook is 5474mAh: Here's what mine says: Battery Information: Model Information: Serial Number: ------- Manufacturer: SMP Device Name: bq20z451 Pack Lot Code: 0 PCB Lot Code: 0 Firmware Version: 702 Hardware Revision: 500 Cell Revision: 3629 For best performance, replace your battery when you reach its maximum cycle count." Where maximum cycle count for macbook air m1 shows 1000. Current state of my m1's battery is "maximum capacity 87%" and "cycle count 192". That perhaps says maximum capacity will reach to 80% where cycle count will remain way lesser than maximum (i.e, 1,000). I see the latests Macbook Pro 16" has a 100 watthour battery - how do I find the equivalent stat for my current Macbook given the info under About -> System Report -> Hardware -> Battery Information? My guess is take the full charge capacity (3582).