Now seriously, that's a terrible idea. Under no-load conditions, you'll have 8.0V, but when you start pulling current from them, ugly things can happen. This is why series strings of batteries should always be balance-charged and ideally, the individual cell voltages should be monitored at all times.
BTW - If I have a Single Battery in a Modern VV/VW mod, and it's charge is say 4.0. And I set my mod for an output of 6.0 Volts.
Is the Board somewhere running 4.0 Volts and 2.0 Volts (Not withstanding Efficiency) in series to make a 6.0 Volt Output?
Or is the Board effectively Doubling the Input Voltage to 8.0 Volts, and then Reducing it to 6.0 Volts via Buck?
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