Hello. I have a MacBook Air (early 2015), but has been active 2.3 years. The battery has been drained and recharged 344 times. The health is 89% when its 100% fully charged. When I use it in lectures at uni it only lasts for about 3-3,5 hours. There is no apps that use significant battery and the bluetooth is off. I only use Microsoft OneNote.
Is the battery destroyed and need replacing? Or is this normal?
Your battery health is 91%, has experienced 344 cycles, and it is over 2 years old and I'd expect something similar from a computer that's nearly 2 1/2 years old. How long your battery will last during the day is directly determined by several things: 1) how bright your screen is, 2) the CPU intensiveness of the programs you run, 3) what (if any) USB devices you plug into the computer while on battery. Another invisible drain are rogue processes. A rogue process is an application or an OS process that is really busy behind the scenes so you aren't even aware it is hard at work.
Its quite common for people to report: well all I did was browse the Internet and answer emails. In 3 hours the battery was flat. Browsers can be very CPU intensive. Activity Monitor has an energy tab that indicates how big an impact apps are having on the battery and a graph to show the overall impact your activity is having. It would be a good idea to keep an eye on this so you can get a feel for what is draining your battery.
Two ways to check the health of the battery.
MacBook Air battery only lasts 3 hours on
