Whoops!
Just went to check the charger: it was still in the bulk charge stage, but in "overheat protection" mode - current output was scaled back.
And it's not even hot out - only about 12 C.
I unplugged it for a minute, and left the hatchback open so it could get some air. Seems happy now.
I guess that's one downside to a pack with more capacity: the charger has to work harder, longer, and can get hotter.
I suppose that's why I have literally burned out a component on the 24v charger twice now: Not designed to be on two parallel strings for that length of time.
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