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As I mentioned in my first post, the Li-Ion pack has been specifically R&D'ed for this purpose - this includes also the CCB.
I haven't been able to find a commercially available product, hence I had to design and build it on my own...
I found 2 sources for a PCB for the Li-IOn batteries, They are huge compared to yours, but will fit in the serpac.
http://www.batteryspace.com/pcbfor148vli-ionbatterypack5alimitwithfuelguagesocket.aspx
http://www.all-battery.com/protectioncircuitmodulepcbfor148vli-ionbatterypack4cellswith65alimit-lipcb14v4.aspx
I finished my Pimeta and have been listening for a few days. I went with a smd build using thin film resistors, smd capacitors, with audiophile grade capacitors in a few places. I'm currently using OPA627's.
Impressions so far:
Clean, very detailed sound. On well recorded material you can easily pick out individual voices and instruments.
My only disappointnent is is the battery life using 9v rechargables. I intend to change this to a 15v lion battery pack. I couldn't find a pre-built battery pack that will fit, so I'll have to build the pack myself using four of these 680 mAh cells:
http://www.all-battery.com/TenergyLi-Polymer3.7V680mAh603040Battery-30191-0.aspx
A question on the Pimeta V2 board. At the bottom of the board there are four holes. Are these for mounting a daughter board?
Can these be cut off? If so I might be able to squeeze in this 900 mAh cell instead.
http://www.all-battery.com/polymerli-ionbattery37v900mah463455.aspx
A few pics of my build: