John, I did some web searching for a card backup drive like the one that Stever mentioned and found what looks like a beauty. It provides the kind of battery solution that you're looking for. The device is called the Hyperdrive Space, and it is made for backing up any and all camera memory cards. It is small, light and rugged. It backs up at the rate of 1GB per minute, has an internal lithium battery that will copy 100GB on a charge, has an accessory external battery holder for 4 AA batteries, has lots of data safeguards, and the 100GB capacity model costs $279. The website for this device is at:
I haven't used this drive, so I can't speak to its performance. Perhaps someone else on this forum has used it and can comment.
I got a HyperDrive SPACE about a month ago and love it. Your spec list above is a good list of the best features. Mine came with a promotional battery pack and a car charger, I think you have to pay extra for them now. I purchased the casing only and bought and installed a 2.5" 160GB HDD myself - it was very easy and _much_ cheaper than buying the casing with the drive from HyperDrive.
Instructions are quite rudimentary but workable. The backlit screen is good but the UI is a bit clunky. It works fine after you get used to it, though. The screen is _not_ for viewing, but I've never seen the need for a viewing screen on a portable HDD as SPACE has file integrity verification which is much more reliable than eyeballing the file. Casing is metal and reasonably rugged. There are no weather seals, though. I've been in contact with customer support and they are helpful, courteous and reply within 24 hours.
The best factors are the incredibly long battery life and different verification schemes. You can choose no verification, partial (checks every few files) or full. It copies my Sandisk Ultra II 2GB card in about 2 minutes without verification, a bit over 11 mins with full verification. All you have to do is slap in the card and it does its thing without a press of a button - if so needed.
Oh, and it also functions as an external HDD. I partitioned mine in two partitions, one for CF backups and one for computer use. HyperDrive can access both multiple partitions as long as they have been formatted with FAT32.
In the end, the only minor complaints I have is the clunky UI and lack of weather sealing. Thankfully you don't need to use the UI for almost anything after setting it up - card copying is automatic after insertion and you have to push just one button after attaching the USB cable to a computer. Also, I don't know how effective weather sealing would be in a gadget that has several large ports for different memory cards.
Somebody on this board complained that they bent pins in their HyperDrive's (I don't remember which of their models) CF reader slot and had it returned. I haven't had that problem but I try to be careful as the pin-bending seems to be a problem with cameras as well.
SPACE does everything their advertising material claims and it does it well. I spent a lot of time studying different portable HDDs, and SPACE is, IMO, the optimal mix of functionality, size and price. Next time I take an extended photo trip I'm going to buy another one for double backups.