Battery performance measurement

Trying to get some opinions on the best way to test performance of my Multistar 14.8v 10c 16,000 mAp battery.When I fly my drone (designed for a 24 pound max lift) with 10 pounds, the red-blinking warning light on the drone's DJI controller starts after 30 seconds of flight time. Makes no sense. Battery cells are fully charged and balanced, conditions are normal, and the warning light settings for low-battery are at 12 volts.Thinking perhaps the discharge rate is too slow for the payload, or the discharge is not really 10c, I'm hoping to test its performance in flight. But I don't know what to connect to it...Should I attach one of these (see pic) and just run it on the ground?Any thoughts welcome.Regards,Peter F

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