What voltage would a core unit need through it's expansion port?

[soop]

I'm guessing it bypasses the regulator?  Basically I'm gonna battery power that and a screen - can I get away with 7.4 volts do you think?  The screen takes 5v fine, but the PCE doesn't (through the regular port),  Would I actually need to pass it through the regulator?  Or stick a regulator between the battery and the port?

[Frank_fjs]

Pretty sure the PCE would require 5V from the expansion port, and not a drop more due to it bypassing the regulator. The fuse and power switch are also bypassed.

I'd wait until someone else can confirm though as I'm not 100% sure and I'd hate for you to blow up your PCE.

[soop]

Thanks man   to be fair though I do have a few lying about

I could probably disconnect the regulator and move it round back if need be?