I hope someone else can respond, I have not had mine long enough (though I don't know if they consider it a mirrorless P&S) if so though, I'll have to use it a bit longer to know. I'm fearful the battery life is NOT adequate, as it's a tiny Li-ion. Certainly it will drain if I run the wifi app too much. Which I doubt I will. Worst, I can't even get a 2nd battery anywhere yet as it's a new design.Honest question....what is the battery life like on a mirrorless P&S? Enough to get someone through a whole day of shooting?