Normally they run away or head for reloads when out of ammunition. Is it possible you destroyed its engines during the battle?
No, as far as I know its untouched, I did not engage it. I think this was the ship which destroyed my geo-survey ships and probably my FGs from way outside my missile range. All I had left were laser armed FACs that closed the contact, which just sat there instead of blowing me away. It has a thermal of 1500 and is 14700 tons, and while there were a couple of alien wrecks in system from which I didn't get tech data on salvage, I assumed they were ancient, not recent NPR (I could be in error but it was the second system I entered and having been two systems beyond found nothing.) I have continuously kept a FACs squadron on top of it since the battle (they have better endurance than my FGs).
This ship has sat there over, it turned out a ruined city for about 4 years while I scrambled to rebuild my navy and upgrade ship yards and eventually build more geo-survey ships, which have just located a precursor listening post. We will see what happens when I invade the precursor installation. If I had thought it could reload I would not have left it untouched for so long

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Regards