Couple of months update, watch did require a new battery as it kept resetting to zero on the displays, and was losing time. No flashing though. I replaced the battery which was an easy task, having an easy to remove caseback. I replaced with the correct spec battery and all is good. NVG lights up and all has been ok so far. I keep the displays off at all times to preserve the battery life, but I do find it gets turned on very easily if you catch the button during wrist movements.
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