Hi all,
This is what I got (I'm in Shanghai so easy to get hold of). You can attach a second battery for added backup and very coolly there is also a solar powered version/attachment (shown in the manual).
http://ape-battery.en.alibaba.com/product/408659348-212242667/50W___for_notebook_MP3450D__DIY_type.htmlAs for usage, I just got back from the pub here in Shanghai. I've left the Mono on with the battery all day and it's still ok, so I'd say my 5-8 hour prediction was a little conservative.
The battery comes with a pack of different adapter attachments and is +tip so requires no modding in anyway. Ready-to-use right away.
If you're a Mac person, it will also charge an iPhone and run the Mono at the same time.
I would imagine this would also be capable of powering the MD/OCT too.
Joe