New to rebuilding.
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Long story made super short, it is exactly what it sounds like. A battery cannot continuously expel its capacity while under load (atty resistance). Energy is lost when current travels across anything that has a resistance. This is what we call "voltage drop."
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A device - unregulated mechanical mods most frequently discussed - is nothing more than a battery case with a button to close the electrical circuit between the battery and the atomizer. If the device has any resistance to the flow of current... also called resistivity, or poor continuity, it will produce a loss of voltage between the battery and the atomizer coil(s).
For example, if we have a battery that meters at 4.17 volts, and we install it in a mech mod, handicapped with poor continuity due to a button with a design inadequate or inconsistent to carry voltage effectively.. we will see a voltage measurement less than 4.17 volts at the atomizer. There are variables, like the load applied, that will effect the final net voltage reduction.
A good reference, specifically for mechanical mods, are the ongoing, well developed and methodical voltage drop tests conducted by jkuro on the Calivapers forums. Extremely small losses are mostly academic in value... however, depending on how deeply into sub-ohm territory the user wishes to build their coils, (arguably) loses in excess of 0.10v can have an effect on coil performance.
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