Anyone out there have a schematic for a proper hp310 (hp3xx...)
charging cable showing which pins/wires to bridge with which type/
value resistors for operating it using an external 5v battery power
source such as the Socket Mobile Power Pack that they'd be willing to
share?

I think it's Gnd, blank, 3v, 3v, & 5v on pins 1,2,3,4,5 respectively,
with the metal jacket of the male mini USB also plug end also being
grounded... but want to confirm this and need to know resistor value/
types as well. Tips & tricks welcome...

http://www.socketmobile.com/pdf/acce...er-pack_ds.pdf

I already know where I can buy the complete cable to do this, but I'd
rather just make one... so I don't need any advertisements of where to
go for a plug-n-play version.

TIA,
-Paul