GreenBattery

High quality app to monitor the battery level of your MacBook. You can easily change the battery icon orientation and decide if you want to display the percentage. When your MacBook is connected to a power source, the app will display a bolt or a power plug icon depending on your selection. Note: if you choose to "Launch GreenBattery App at Login" on the Welcome screen then the app will be launched automatically at login. However, this feature may not work on all systems. It depends on your security settings. You can also do it manually in System Preferences -> Users & Groups -> Choose your user -> Login Items -> Click "plus" sign and add GreenBattery to the list.