When I upgraded to Zorin on my Macbook Pro Retina, I've been having a minor battery issue. I'm not sure if it's the OS or my battery. When I charge to 89%, my Mac charger turns from orange to green. It goes further than 89%, but if I do and disconnect the charger, it drops to 89%. My other computers don't seem to do this.
Battery life starts to degrade after a year or two (especially in notebook computers)
Most of the battery is being used by background apps. (installed without users notice)
Battery life is mostly affected by screen brightness.
OS is Degrading battery life.
Suspending PC also depletes battery life (majorly in old PC's).
Restating services or opening or starting app without preload installed leads to additional battery usage due to high memory consumption caused due to the restart of the service.
I second this. Please calibrate the battery for the Linux sensor.
I usually suggest two or even three full cycles...
It's rare that calibration does not work. If it doesn't, it may mean the battery is at fault.