Prearm : battery 1 below minimum arming voltage

ArduCopter Copter 4.4
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Using lithium ion battery 33600 mah 6s 2 battery

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So what value is your BATT_ARM_VOLT parameter at?
And what is your current voltage of the battery?

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No problem in that. If your Power module is working and if battery failsafe voltage and reserved current is set, then no problem.
Also, try to do the battery monitor calibration in optional hardware. Set the present voltage and current in it. If all this is configured and still the error prevails, then surely the Power Module is dead. Try to check all this and then reply with the situation.

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I don’t know the exact parameter values of Li ion battery can u help me for set the values I am using lithium ion 33600 mah battery 2( 6s )
And using cuav plus flight controller in hobby wing x8 motors in hexacopter