I totalt understand the need for a break after a long battle.
The problem with this mechanic is that people can Gank (i have no issue with a decently fair fight, however when its 10 on 2 or numbers like that thats just annoying, since it takes a while to get sunk in this game) without any risk.
If there is a counterfleet they will just sign out in the battlescreen with all the stuff they have potentionally taken. That gives almost no risk and still all the reward and its really annoying me and my clanmates that iv been talking too about it.
Maby a function that you can stay in the battlescreen a percentage of the time the battle itself took would work. Then people would be able to take a bathroombreak, a smoke or whatever.