FruitJuice works by tracking the battery's condition and usage in real-time and provides a complete picture of the battery's health in a simple, elegant OS X interface.
According to the "Apple Notebooks" webpage:
"The built-in battery of your MacBook, MacBook Pro or MacBook Air is designed to deliver up to 1000 full charge and discharge more...
- Fix cosmetic bug causing yellow warning area to show, especially when running with multiple monitors.
- Small adjustment to height and alignment of battery meter.
- OS X 10.8 or later