I am not departing without a battery. I am flying and now suspectively losing my battery. So what? I do not have a 60 min backup for my instruments if I loose all three generators? You think the safety of the aircraft is jeopardized if this single battery dies enroute? You do not think that Boeing would not install a 2nd one as standard equipment, if the life of 180 people would depend on it at all times?
Looks like common sense left the cockpit again.