FruitJuice 2.5 | macOS | 7 mb FruitJuice is a Mac application and online service that helps maximize Apple notebook battery life and runtime. FruitJuice makes it possible to follow Apple's recommendations for ensuring longer battery life and accurate "time remaining" estimates when running on battery. It 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.