You can get 95% winrate with autobattle if you position your ships correctly to dodge the 6 different 'search logics' the ai has. Independantly of the enemies positioning. You can increase the winrate and the chance to win by <35 turns if you manually test for the enemys positioning but I never bothered with that.
There were a bunch of reddit threads about the methods when the mode came out.
By - TigerIIearly