Dealing with massive voltage drop

Hi everyone,
 
I'm using the pixhawk (px4 firmware) on a DJI  F450 with the 3DR power module (accurate readings) and Turnigy 3s  2650mah batteries.
 
I've set BAT_CAPACITY to -1 for now because I want it to only consider voltage readings.
BAT_V_EMPTY is s

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