Ah, my post maybe was not that clear - I actually bought a new battery which fixed the issue. My initial attempt of unplugging and reconnecting the old one didn't help things.

But it just died? Just like that? Probably should have taken off the positive terminal instead of just the negative. Or take off both and touch them together for a minute and then put back on to drain your electrical system. It's as common as checking fuses. But if you're happy with new battery then you're happy.

What does it do when you touch both post and net together?