HP 852724-601 is a notebook system board for servicing a system built around the UMA i3-6100U WWAN WIN configuration. Its exact part number identifies this specific board variant, rather than one of the nearby system-board numbers for different configurations.
The ProBook 650 G2 spare-parts list also identifies 852724-601 as a system board. This makes the board relevant when replacing the corresponding part in a system using that listed configuration.