I'm so sick of having to buy overpriced batteries every time I get a new camera because there are no standards. With something like this you could have a universal pouch with cables for your different rigs. They all run on the same voltage. Any camcorder that charges the battery internally will have a dc port that you can jack into, A rig like this would also field charge your standard battery, interesting possibilities, good find.
I got the Onyx 220 charger. It's only a few more dollars and let's you charge from a 12v battery as well as 110v. Got it new on Ebay for $59.95 with free shipping.