Installed Yosemite and lost my volume control on the Mac menu bar - Finder left end - Battery, etc. right end. Can this be customized? I did find the volume control under sound and was able to add that icon.
MacBook Pro (17-inch 2.4 GHz), OS X Yosemite (10.10.1)
You should be able to enable the battery icon in 'Apple menu > System Preferences > Energy Saver' (this is on 10.9, so use the search in the Preferences window if you can't see it).
The menu items are stored in a system folder, double clicking then should put them into the menu bar.
The location is /System/Library/CoreServices/Menu Extras/, just do not try to edit or delete those items & you should be fine.
Use cmd+drag to remove or reorder the items.
You should be able to enable the battery icon in 'Apple menu > System Preferences > Energy Saver' (this is on 10.9, so use the search in the Preferences window if you can't see it).
The menu items are stored in a system folder, double clicking then should put them into the menu bar.
The location is /System/Library/CoreServices/Menu Extras/, just do not try to edit or delete those items & you should be fine.
Use cmd+drag to remove or reorder the items.
In the Sound pane of System Preferences, check the box marked
Show volume in menu bar
How do I customize my menu bar
