Small boardview in .brd format, 14 KB, named charger-d, which points to a charger or charging daughterboard; no brand or model appears in the name. BRD files of this type open in OpenBoardView, FlexBV and similar viewers, showing part placement and net connections. It is useful for tracing the charging path, finding test points and locating shorted components on a small PCB. Match the outline and part labels to the physical board, since the device it belongs to must be confirmed separately.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @vinafix_bios. Enginerys does not host this file.
How to open a .brd file
The most common boardview extension. Several unrelated formats share it, which is why one viewer opens a .brd and another refuses it.