Battery Life Extender
The nimblest battery life extender solution for your MacBook. Free.
A little utility to help you make your MacBook battery live as long as possible.
It helps you by notifying when it's better to charge or unplug your beloved laptop.
"Apple does not recommend leaving your portable plugged in all the time."
A short bash script is copied in /usr/local/bin and it is executed every 8 minutes by the built-in OS X utility launchd (an Apple equivalent of Linux crontab).
It asks the operating system for the battery level. If it is >80% while charging or <40% while not in charge, it sends you a notification.
The above battery levels were chosen after a long research on how lithium batteries work and how Apple implemented them in MacBooks. You can read it here.
For further info and installation instructions, please have a look at the README file.
BLE is nimble and unobtrusive because it uses the system utilities built in macOS.
Easy to install and to remove, requires no user interaction to work.
BLE is released under the GNU GPLv3 license and is availble on GitHub.