Rockman Operation Battle Starter OS-01 Blues [Japan Import] (Gameboy Advance)A Battle Chip is a data storage device in the Megaman Battle Network series that an operator can insert in the PET to transfer its data to a NetNavi, giving support in combat. There is a wide variety of Battle Chips that serve various purposes, like giving armament to the NetNavi use as a means to inflict damage or providing a line of defense to the Navi fall back on.