I saw mention of these batteries in one of these threads and decided $38.00 wasn't too huge of a roll of the dice.
http://www.ebay.com/itm/5V-9V-12V-DC-Rechargeable-Li-ion-battery-CCTV-ep-/320733873198?pt=US_Batteries&hash=item4aad3a842eShipping took about two weeks from Hong Kong. The battery arrived with a 12v wall-wart charger (with super short cable) and plugs and cables for 5v USB, 9v and 12v. None of the supplied tips fit anything I have. The included 9v cable has a tip that's way too long for the depth of the 9v receptacle and it was also jiggly. I wanted to see if I could run my pre on this. Others have found that the supplied 12v cable fits a DR-680. It has an on/off power switch - that could be a good thing or a bad thing.
I think at least one person has mentioned that they received a battery like this or similar that was DOA and someone else had one balloon up during charging, which can't be good. They are cheap, and you might be taking your chances a little with these batteries until there's more feedback on them.
TGakidis had made me a 5v USB power cable for my Edirol R-09HR. The deck runs fine on the 5v USB outlet.
Then I went to Radio Shack for Adapta-plugs.
12v outlet = Adapt-a-plug tip
K9v outlet = Adapt-a-plug tip
HI ran my Wendt X-2 just fine on the 9v outlet, so given the 9v capacity of 8500mah this looks like it has more juice than my Initial RB270 DVD batteries (at 5400mah) and its smaller and lighter. This battery could be a fine replacement for those batteries eventually (fingers crossed), but it has no LED meter and who knows whether the built-in electronics will prove reliable.
The whole kit:
Label on the side:
The label on the back showing capacity ratings:
The top:
I dug the goo out of the holes covering the screws and took it apart. Inside are 3 Li-ion cells and the tiny circuit board (pizza crumbs for scale ;-) ):