Michael Rapadas slashes the price on his neat utility to $0 until Monday

Jan 11, 2014 19:16 GMT  ·  By

They say Li-Ion batteries, such as those found in our MacBooks, have this optimum charge level between 40% and 80% which keeps the cells healthy and boost their longevity.

Developer Michael Rapadas capitalizes on this valuable piece of information by selling a uniquely tailored Mac app which alerts the user when it’s time to start and stop charging your laptop using the 40/80 rule.

Michael says “The latest research reveals that keeping your battery between 40% and 80% is the best way to keep it at its healthiest,” and provides a handy link for scientific proof.

He’s also offering Battery Hero for free until Monday, giving everyone the chance to download it and use it free of charge, indefinitely. The app should theoretically help you expand the life expectancy of your MacBook’s battery, saving you from a premature trip to the Apple Store for a replacement.