Pilot:
"Sorry Boss, we can't get to the destination for your important business meeting....battery's run flat. That's it for today. I'll get you a taxi and I'll try to get the aircraft recharged overnight. I'll come back for you tomorrow and do the same again... Look on the bright side, we have more TBO on the drive components!"
Boss: "You're fired!"
Or alternatively...
"Sorry Boss, we can't get to the destination for your important business meeting... Aircraft in for maintenance again. That's it for this week or two.
I'll get you a taxi and I'll try to get another aircraft hired in. Then in another 50 hrs we do it all again".
Boss: : "We're stuffed"