key word in your sentence is can - it is not an absolute or guaranteed.
If you have issues with flavor changing the juice may not be suitable for mechanical vaping or you are not building the coils for best output, you are building them for something else either maximum clouds or some weird micro hex nano coil whatever.
I have several mechanical setups here with geni's, drippers, even a kayfun, and there is no difference in flavor until the battery drops to 3.5 or lower. the only thing that happens when my battery dies down is i get less vapor. thats it. either I dont vape some crazy mixed blend juices like you have or your not building normal every day coils tailored to the battery.
maybe your results differ, but i go all day on one battery with no issues end of the day pull it out around 3.55v and charge them
like a lot of things, not every juice is perfect in every device, every device isnt suited for every type of battery and so on.
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