The Li Ion SPS is a FRUable 10-lb battery, removed from the front of the system. The SPS transports separately and will be part of the install procedure. SPS units have 2.2KW capacity, and provide two five-minute intervals of battery life to allow vaulting in the event of a power failure. In System Bay 1 of a single engine bay, there are up to two SPS trays (four SPSs total) to support the engine and Fabric, if installed. In System Bays 2 through 8, there is only one SPS tray (two SPSs) to support the engine.
When installed in System Bay 1, SPS 1A and 1B are cabled to both the engine and the fabric, and SPS 3A and 3B are also cabled to both the engine and the fabric. This is true in multi-engine systems only. In single engine systems, SPS 3A and 3B support the engine only.