Problem with battery failsafe

@krisclarkdev wrote:

Hi everyone! I have a feeling I have something misconfigured in mission planner specific to my battery failsafe.

Specs:
Six 920 Kv motors
Six 30 amp ESC's
One 3S 6500 Mah venom battery
One pixhawk flight controller
Flight time ~= 5min
Battery failsafe = 10.2
Starting voltage @ battery = 12.60
Starting voltage @ mission planner = 12.44
Ending voltage @ mission planner = 11.79

Problem:
I have mission planner to trigger the failsafe at 10.2 V. About five minutes into flying I am given the failsafe alarm because the battery has hit or gone below 10.2 V. Which seems strange to me.

After landing, my battery bounces back up to 11.79.

To add to the issue, after balance charging my lipo to exactly 12.60 I connect it to my model, connect telemetry via usb on mission planner which shows a starting voltage of 12.44.

Not only that but mission planners HUD shows 87% left.

So I guess my question is multi-part

1. Why am I seeing a difference in voltage of .15 volts?
2. Is there some configuration setting that I might be overlooking?
3. Why is my lipo voltage jumping so drasticly after landing?
4. Do I really have 87% battery left as indicated by the HUD?

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