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What type of battery maintenance does the PS-823B power supply require?
According to L3 Service Letter SL-8 (Rev. U), battery pack inspections and testing should be performed at the 100 hour or 3 month period of operation. In addition, the same applies for any unit not operated for 15 days or more. While the bulletin details the testing procedure, the battery pack charging procedure should be followed if the voltage is less than 19.0 Vdc.