I noticed a very interesting aspect about the MacBook air's battery over the years. I bought a MacBook Air 2013, and recently I replaced it with the new MacBook Air 2018 13 inch Retina display.
I ran coconut battery on both devices, and surprisingly the 2013 MacBook Air had a design capacity of 7150 mah, while my 2018 MacBook Air has a design capacity of only 4381 mah!! Both my macbook's battery are in perfect condition.
So what is going on here? Obviously every year the MacBook gets better battery life, so is the battery usage just more efficient as time goes on? Thanks for any reply.
EDIT: I just have a bad feeling my new MacBook has a defect. Does anyone else have the 2018 MacBook Air and have a bigger battery? If so I'm returning this computer for sure.