A newly installed EXO battery requires calibration to deliver the best performance. The LiFePO₄ battery is calibrated during the first few full charge and discharge cycles. The cycles allow the battery management system to accurately calibrate the state-of-charge readings and balance cells within the pack. While the battery is calibrating, EXO's runtime may be shorter. Once the calibration is established, the battery will deliver the expected runtime and optimal performance.

The standard battery pack can power EXO for over 100 days, and the lightweight version for over 50 days. Battery life varies depending on device configurations, low urgency and high-urgency notification response, operating temperature, sensor types, and pump usage. In operational temperatures below -20°C (-4°F), the battery pack's runtime drops significantly. See the Cartridges and Extreme Weather section for more information about running EXO in cold temperatures.