My K3/P3/VGA monitor are happy with power from 
http://bioennodepot.com/lithium-iron-phosphate-lifepo4-batteries/bioenno-power-12v-40ah-lfp-battery-pvc-blf-1240w.html

It's small enough to lie flat on a shelf with 3.5" clearance with a footprint 
smaller than my iPad.

My KX3/PX3/KXPA100 run on another identical battery.  These have plenty of 
capacity to power 100 watts CW for longer than I can stay active.  They start 
out at 13.2 volts and stay there for hours.  I do use #10 AWG wire, though, to 
minimize resistive loss.
-- 
Marc W8SDG

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