When I bought my brand new Macbook, it was like 9-months old (according to battery production date) and still had almost 40% charge on first turn on.
But after that, every time I charge my Macbook (to around 50%) for storage when I don't plan to use it and Shut Down the Macbook, the battery is completely drained (it won't turn on before charging) after only 2-3 months
This happens almost every time, I don't understand why (I know dropping a few percentage is normal, but not the entire battery...)
- I am sure it is turned off and not just in sleep mode.
- I store it in a 18-24 (Celsius) environment.
- My battery holds perfectly (around 8-10 hours) when device is on and I'm working with the laptop.
- Battery Health 2 application shows the battery health is 98% (4294 mAh)