Simple extra battery for the expansion bay

[Kyle_Reis]

@James3

Is the expansion bay wired such that it can hold a battery. I.e. are their actually wires from the expansion bay to power the laptop ?
I think the wires only cover power from laptop to expansion bay, and not the other way round.

Yes.

The expansion bay has 6 wires (and 6 ground wires) that are specifically for this.

From the expansion bay documentation on those 6 wires:

This allows power to be fed from the Expansion Bay back into the laptop in an Extended Battery scenario or another type of card that has a power supply attached.

Each of those 6 wires is rated for 15w, so a total of 90w.