how do you check the voltage drop on a mech mod?
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It's easier with an inline volt meter that you screw in between the mod and the atomizer. It's doable with a multimeter as well but you'll need to take off the atomizer top cap and measure directly at the positive and negative posts. Measure under load (with an atomizer screwed in), otherwise the reading doesn't mean anything. You'll get more voltage drop with lower ohm coils. Note that the internal and resistance of the battery plays a major role in voltage drop, and if you want to compare mods you need to use the exact same battery at the exact same charge level, and use the same atomizer and coil for both mods.
Yup that's exactly correct you could Google it if that's enough for you but if not do what he said up there
If you want to know what the mod's voltage drop is, it's difficult to remove the battery which typically has the vast majority of the v-drop in the system from the equation. jkuro, over at CaliVapors does a great job of measuring mods. Check out how he does it here and have a look at his findings on a bunch of mods.
I check battery V-drop under load in a clean K100 that I don't use any more with a 0.5 ohm atty that I only use for this on it. I do it when I first get a battery then check it every couple of months. The V-drop will increase over charge cycles and when it gets too high for me I recycle it. Always using the same mod and atty means they don't change resistance so I'm only comparing battery changes.
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