the only way I could see needing anything like a PCC for an eGo...would be if you're doing something like a camping trip where you'd be away from a power source for more than a day...
in that case something like a kensington portable battery pack and the USB fast charger would be all you'd really need.. could throw something like that into something like a pelican micro case....and you'd be set....it'd be big... but'd work...but that'd only be a neccessity if you're away from all power sources for more than a day like I said..