Prius C 2014 won't enter "ready," a day after jump starting it. I drove 3+ hours after the jumpstart no problem.

EDIT: SOLVED. It was indeed the key fob proximity-trigger thing not working. "Fob-to-Start button" manual start works just fine.

I dropped the fob later in the day, so I'm wondering if that's the issue. I'll be testing the manual "press fob to button"-start method in a few minutes. But, given the fact that I drop the fob all the damn time anyway and the other fob functions work, and that this happened so close to jumping it... seems it's battery related, no?

I had thought it died the other day because I left the lights on, but maybe the battery was just dying? Or is it more likely that I messed it up somehow when jumping it? If that's the case, I shouldn't have been able to drive it all day after the jump, right? (Which included me stopping car for 3.5 hrs and then starting it back up and driving 90+ minutes home).

Battery says 65-75% full on the display, driver-side door opens with proximity-trigger (but the passenger doesn't(?)), all other key fob functions work, car has ~90K miles on it. Totally at a loss. Do I take it to a shop, or do I buy a new fob, and, if that fails, a new battery?