Phil,
Operating portable with a KX-3 and KXPA-100 running 50W I typically observe 6-8 hours of useful life per charge using this jumpstarter battery:
http://www.amazon.com/gp/product/B00KBINF7G/ref=oh_aui_detailpage_o05_s01?ie=UTF8&psc=1 They advertise that this is 18AH, but they do not advertise the low-voltage point of their measurement, so take that for what it is worth when you make your comparison.
-DwightKF5WOE
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