Ha, everyone who has owned a boat for any significant amount of time can share similar stories!
This past year my battery too was dead upon initial startup. Second time out with fresh battery required a second trip home to get the keys. Our family has learned that when you try to pack a full day of fun on the water for a young family you inevitably forget to pack something important along. I'm sure that the last outing of the season we'll finally nail it, or not.