An update - the battery died just short of four hours, reading 0.0 V at P+/P- and 8.4 V at B+/B-, which tells me that the BMS went into standby. I reset it by plugging it into the charge for a split second, and the lights came back on for a few minutes.
So, four hours at full power, give or take. Tomorrow, we'll try it at 50% power to see if it lasts eight hours.
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