Abstract : The performance data and design configuration of the PP-4126( )/U Battery Charger are delineated in this final report. Performance of the unit is summarized. Terminal performance and selected aspects of internal performance are considered. The internal system configuration of the battery charger is presented in block form. Functions of internal system blocks are discussed to define their design and behavior. Circuit components used to implement the systems blocks are identified. The PP-4126( )/U Battery Charger is designed to charge 6, 12, and 24 Vdc batteries at selectable charging rates from 0.1 Adc to 12 Adc. The battery charger operates from MIL-STD-704 dc power sources in the range 22 Vdc to 40 Vdc. The battery charger structure is a finned housing with a removable cover. The cover contains the input power cable. The battery charger may be operated in any position.