Can I assume from the fact that you are using 7.4V batteries instead of higher voltage Li-Ion batteries (8.4V) that, at least in the desktop portable, you are doubling up the current to run the + and - rails at 14.8V instead of 7.4V, i.e. perfectly in line with your usual PSU voltages?
For the Portable Micro, are you using a rail splitter or something more elaborate to get the + and -, and from the single battery are the electronics +/-7.4V, or is it a single rail supply?
I see that you've put a 'preamp out' on the back of both the new units, however isn't that in reality just a further headphone jack on exactly the same circuit as the front outputs? That's not a criticism - I know they work very well that way as preamp outputs - just a detail.
I hate not knowing all the little details!