If you noticed your battery life has diminished since upgrading your mac book to el capitan. It is very possible that the OS has changed your battery mode to high performance or some apps are responsible.
1. Visit System Preferences, go to Energy Saver, and make
sure that your sleep mode settings are just how you prefer them. Pay
special attention to the apps that require your Mac to be awake. Switch
off “required” apps that may be keeping your Mac running at odd times.
You should also try quitting out of iTunes, your printer, and any
running third party apps.
2. Check your Wi-Fi settings and your apps to make sure that no apps are
stuck in a permanent download state. If they are, delete and reload them
via the Update section of the App Store.
3. If your settings and startup seem especially sluggish or a bit noisy, you can try resetting your PRAM. Go to the Apple Menu and use Shut Down to turn off your computer. Turn your Mac back on, and as it starts up hold down the Option-Command-P-R
keys before the logo screen can appear. Hold these keys until your
computer automatically reboots. This will restore startup functions to
factory settings and may help your problem.
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