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Lowest safe battery voltage

Hi folks,

I am running a dual 18650 unregulated series pwm mod with a built in voltmeter.

My question is what is the lowest voltage reading to safely run the batteries?

I have read that 3.5/3.6V is the lowest you should run a single sell. My assumption would be that for a dual series box this should be doubled, resulting in 7.0/7.2V. Are my assumptions correct?

Also, I only see the "true" voltage reading once my atty is not connected. I'm running a 0.4 ohm dual coil and when i set my potentiometer to 100% I get a 6.69V reading. When I disconnect the atty i get a 7.65V (+- 1V more than with atty connected) reading.

Do I need to disconnect the atty every time I want to get the true reading? Or can I just set the pot to 100% with atty and add 1V?

Any advice would be extremely helpful.

Thank you in advance
 

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