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Is the polarity correct on the cable, pos (+) ring, neg (-) tip? Have you tried with a different, known-good cable, i.e. the one that works between the other ESA battery and the UA5? Does the ESA work with any other devices?
I use my UA-5 power cable (with the "M" and "B" adapaplug tips) for alot of things around the house, and I *always* forget to switch the tips back to the "right" direction to work with the UA-5. Like you said, when this happens the battery seems to "freeze" or something and needs to be reset by plugging it into the charger.