I've been powering my rig off of a 10.8V Li-ion (homebuilt from ebay parts) since 2003.
The ad2k has all of its headroom down to about 9.5V. I have a switching regulator built in that delivers a constant 6.00V to the v3 and extends run time instead of wasting heat in the V3
the 10.8V li-ions run from 12.5 down to 10.8 before voltage starts tumbling rapidly.
heres the page i made about it way back when.
http://www.simplefuels.com/tapergeek/liion.htmi recently bought new cells for like $1 each on ebay
Guess this is a power question. But It's also a pre/AD question IMO.
For the few still running these what are you powering them with? Real tired of lugging 2 12v's around.
Jeff