How to Show Remaining Battery Life in the Mac OS X Menu Bar
STEP 1. From the upper right corner of your Mac OS X screen simply click on the Battery icon.
STEP 2. Then simply pull down to ‘Show’ and then choose ‘Percentage’ or ‘Time’.
That’s it. Now you will be able to get continuous update on battery life from the Menu Bar of your Mac OS X. If you found any difficulty in following the above steps then feel free to ask in the comment section below.