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Battery failsafe level?

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@mrwooster wrote:

What is the best way to determine what to set the battery failsafe to?

I am using a 3S and set the failsafe to 10.5V - I only get about 5 mins of flight time, then the failsafe kicks in. As soon as I remove the batteries and check them, they are still measuring close to 12V (tested on 3 batteries).

Obviously this is due to the load...

Is there 1- a way for Copter to account for the battery load?
2- a way to calculate what to set the failsafe to other than trial and error?

Thanks!
G

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