Couple things:
Be careful with what you put into the power jack. I was working on an external battery option and accidentally applied 9v from a DVD battery without stepping it down first as was the plan. Recorder now will not power on and needs to be sent to Tascam for repair.
Got a replacement deck ASAP from B&H before last weekend's BearCreek fest along with a couple Trancend 32GB class 10 cards and an [edit] EverReady Energizer (XP8000) LiIon power pack which is about the same size as the recorder. The power pack has outputs for 5VDC, 9-12VDC and 18VDC. It includes 5V adapters that fit but stick straight out the side about 3" so I took a trip to Radio Shack and soldered up a stubby cable with a right angle adapta-plug. If I had time to figure out another cable I could have powered both preamps from the same pack using its 9V port, but instead used a regular LiIon DVD battery for them.
Loaded the latest 1.02 firmware on the new recorder and tested with one of the new 32GB cards, recording 24/48 in dual mode overnight. Filled the card with 30GB of data (15 hrs recording time) and only used one bar of four on the external battery.
I ran it 3 days at Bear Creek and probably could have gone the full weekend without re-charging, but topped off the battery once for a few hours (while simultaneously using it to power the deck, listening to some fresh recorded tracks at camp). The 9V DVD batt powering the preamps had no problem going all weekend, only depleting one light. Even with the two batteries the whole 4 channel rig still fit easily in a small shaving kit bag along with some gaffer tape, some uneeded extra AA's and other odds and ends. The combination of massive storage space and battery power makes recording fests simpler, funner, better, faster, stronger..
[edit- I can't recommend running the CA-UGLY(s) off a DVD battery at this time. Had power related distortion issues I did not notice until listening back to the recordings later. I've gone back to using the excellent Powerex 9.6V batteries. Now the higher capacity 230mAh low-self dischage Imedeon version]