"4-pin XLR type battery power input". Guess you'd need a different cable than the old WalMart battery > UA-5 power cable.
as long as it's got an AC in -- and the powering specs haven't changed -- the same battery / cable would work.
i haven't had any power disconnects running into the AC <yet> but having a locking XLR mechanism is a nice touch.
It says "AC power (via adapter)." So, the question is can you just use the adapter. I wouldn't be surprised if you could just splice off part of the "adapter" with our current cables and then run straight into the DVD battery and it would work fine cause I'm betting the power requirements are the same as before.
On another funny, but related note, I had been gaffer-taping my power cord to both the R4 and my DVD battery to prevent accidental disconnect, but a couple of weeks ago I just flat out taped the whole damn DVD battery to the underside of the R4 itself, with both ends of the cord taped to the R4 and the battery such that they can't disconnect. It's been like that for two weeks now, and it even fits in my bag like this and in the original (crappy) Edirol case. Totally classic hack job, but it's actually kind of nice to never worry about hooking up or disconnecting or even forgetting the battery now. HOWEVER, after that whole MicroCrapper explosion catch on fire thing, I've been a little more nervous about permanently affixing the battery to the R4. LOL!