What methods are being used to power the unit? (6v 9v 12v) Pictures would be great.
for external power, you need a 12v battery. I had my HD-P2 out for some DAT transfers, so I hooked up the battery and took a pic. (normally, I just plug it into the wall when I'm transferring DATs)
this is a 12v 4200mAH NiMH battery. it's 5.5" x 3.75" x 0.8"
so it slips into my bag nice and easily. and it sure is a lot lighter than a 12v SLA battery.
I've never run this battery completely empty, but in theory, I think I should get ~9 hours of run time (running S/PDIF in and the backlight off). in practice, I've never really run more than 5.5 - 6 hours or so. and of course, if you were running analog into the unit, using the internal pre-amps (especially with phantom on) and the internal A/D, you'd be sure to get a good deal less run time.