A battery having a display indicating an amount of time the battery can be used before needing to be recharged and/or replaced. The amount of time can be displayed in minutes. An end of life indicator indicating whether the battery should be replaced can also be provided on the battery. The battery can determine the amount of time and an end of life indication based on environmental conditions and/or use. The battery can include sensors for measuring and/or monitoring environmental conditions, as well as a global positioning system (GPS) transponder. The battery can also include a communication link for transmitting data to a central location, a specified location and/or a pre-selected location, which data can include the amount of time the battery can be used before needing to be recharged and/or replaced. The battery can be coupled to and configured to power a device. Particular advantages can be realized with medical devices, especially defibrillators and other Advanced Life Support Devices which are typically exposed to a wide range of end user use models and environmental conditions.
