And correct me if I'm wrong, but I have an Itaste vv 3.0, and when I hold down both buttons on the bottom, it comes up with the resistance of the tank that's on, and then suggests a voltage for you. (that's what my friend told me anyways... could be wrong lol)
That second readout is the voltage left in your battery. It will be around 3.7v when the fire button turns yellow, 3.4v when it turns red.
You will still need to do the math: http://www.evcigarettes.com/product_images/uploaded_images/safe-vaping-power-voltage-resistance-ohm-chart.jpg
Safe vaping Power Chart

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