The reasons for your laptop battery die fast
B: “THE DISPLAY”, you’re right.
The display is major part drain on your laptop’s battery. The single biggest occupier of battery resources, day in and day out, is your laptop's display. The obvious move to extend battery life is then to lower your display's brightness. You can usually do this on the keyboard, but there are a couple other settings to change that will help automate the process.
1.Change your display settings
Managing display brightness, Open System Preferences and click Display. On the Display tab, you'll see a slider for Brightness. Lower it to a point between super bright and depressingly dull. Not only will a display set at a lower brightness aid your battery life, but it will also be easier on your eyes unless you are sitting in direct sunlight and need brightness at its max in order to see text and images.
Keeping your display running while your laptop sits unattended is a needless waste of battery resources. On the Energy Saver page, you can set times for Computer Sleep and Display Sleep, both of which spring into action if your MacBook sits idle for a period of time. Set as short a time as you're comfortable with for the Battery tab; it's less important for the Power Adapter tab.
2.Don't forget keyboard backlighting
Similar to powering the display backlight, powering keyboard backlights can also be a big drain on your battery. First, make sure you turn off your keyboard backlights when you don't need them.
3.Turn off wireless and unplug peripherals
While the display is the primary culprit for draining your laptop's battery, I still want to leave you with two pieces of tried-and-true battery life advice. Turn off Wi-Fi and Bluetooth when they aren't needed. Both wireless adapters use battery power to scan for networks and devices and keep you connected. Unplug any peripherals when they aren't in use. An unpowered peripheral draws power from your laptop, which means it'll drain the battery when the laptop isn't plugged in.V
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