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Safe level of battery sag for Li-po batteries?

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Hello,
I have a 4300 mAh 3s Lipo which I use for my hex frame copter build. There is about 1-1.5V ish voltage sag on this battery when I’m flying. Now this voltage sag very often triggers a battery fail-safe at 10.5V for me. I can disable the batt FS and still fly around but I’m worried about damaging the battery. I’m only able to use about 800-1000 mAh (less than 25% of the capacity) before hitting 10.5V. Log here from my last flight demonstrating my issue.

I’m looking for advice on what I should do to extract the most out of my Lipo. Should I fly it with possible voltage sag to say 9.6V or so? Or is 3 mins of flight time my life now?

BR,
Arth

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