Many of the Battery Backup Systems (BBS) and Uninterruptible Power Supplies (UPS) installed by Norvado have an eight (8) hour minimum battery backup capacity, but some do have a 24-hour battery backup capacity. The frequency and duration of services in use (i.e. phone calls made or received, and internet/television usage) during an electrical power outage will significantly impact the length of time that the BBS and UPS can support service(s). Charge and discharge cycles, battery condition and age, temperature, and load can all reduce the battery backup capacity as well.