Daves own post pointed out that he doesn't carry over damage between battles.
I can't seem to find where he says that, do you mind quoting it for me? >.<
Fleet #8813, 1 blackbird (8813) Battle! -- Menacing jestures were made, but no
damage was done.
I'm ashamed to say I actually laughed at this
I can now finally declare an alliance with Adriddae! I think I'm now allied with every BM player around me