First, your VII has a 2 year warranty on the inverter, and one year on the battery. Septemeber 2010 was under a year ago, so both are under warranty, at least for a few more weeks, if that is when it was purchased.
If there is a short in the cord, that would cause the charger to lose contact, thus flickering the LED. An easy way to test is to use a different cord. These cords are rather common, used in boom boxes, laptop chargers, game consoles, and similar devices. If it works correctly then, we can warranty the cord, if not, other steps will need to be followed.
Also, check the battery cables to ensure they are snug, as well as that the fuses are fully seated.
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