Product Guide - A5000 R5.4 – Aastra X seriesBPS0121AENAA01 Page 37/745.3.7.8 AutonomyAn external backup battery can be optionally installed, to protect the cabinet from a power supplyfailure and prevent service disruption and the loss of critical data. This 19’’ battery cabinet looks likethe system cabinets and is 2U high.The capacity required depends on the configuration.Note: The same battery can be connected in parallel on the three cabinets of an Aastra XL. In thiscase, check that the battery withstands the charging current (7A per ADS350XL power unit (AXL)).For a standard configuration the battery must conform to the following specifications:Battery specifications CapacityNumber of battery elements 4Voltage 4 x 12V(12V per battery element)Capacity (amp/hours) 17AhBattery autonomy 4h on averageNote: batteries of battery cabinets in the Aastra price list have these characteristics.
