She's dead, Jim
I went to use the mower this week and when I checked the voltage before starting (my usual habit), it read only 9.x.
Hmm!
I always recharge the mower right after using it, so my first thought was that I must have forgotten last time. So I plugged it in and left it over night.
Next day: voltage reading topped out at just 12.1. I confirmed the charger output voltage was OK.
So, the batteries are toast. (Well, just one of them is. But in parallel, it was dragging down the good one with it.)
A local e-bike store has used 12Ah batteries for $20 apiece that will work, but considering I have a spare corded electric mower, that's the route I'm going to take from here on.
All good things must come to an end! R.I.P., Black & Decker M3300!
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