The standard battery pack can power EXO for over 100 days, and the lightweight version for over 50 days. Battery life will vary 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 will drop significantly. See Cartridges and Extreme Weather for more information about running EXO in cold temperatures.