The battery pack simply plugs into the back of the mainboard (Cyton or Ganglion). Male plug on pack fits female on board.
The adapter converts up to 8 header pins to "touchproof" connector, which is used on commercial EEG cables. The gold cup electrodes from OpenBCI already have female header connectors which fit onto the board without the need for the adapter. Adapter only needed if you are using commercial EEG leads. But is provided in some of the kits. Two of these 8 cable adapters would handle 16 leads.
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The adapter converts up to 8 header pins to "touchproof" connector, which is used on commercial EEG cables. The gold cup electrodes from OpenBCI already have female header connectors which fit onto the board without the need for the adapter. Adapter only needed if you are using commercial EEG leads. But is provided in some of the kits. Two of these 8 cable adapters would handle 16 leads.