Good news. I let the JBL sit without batteries for an hour. I then reinserted the batteries, and it worked like nothing had happened.
I'd already started charging the other set of batteries, so I'll leave them going overnight. I had been leaving the spare set uncharged until I needed them, but the last time the device went from three bars to one bar in just a couple of hours, so I decided that I would charge the batteries a little earlier this time.
So it's all good, for now anyway.
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