Just chipping in here, to know where your safety is with batteries are 2 ohm's law formulas.
Mech/unregulated
Volts/ohm's=amps. (This is done at battery fresh charge so volts is 4.2v at fresh charge). 4.2/1.0 ohm's=4.2amps, 4.2v/0.5 ohm's=8.4 amps, pretty simple and basic
Regulated mod's, we use a watts formula
(Set watts/lowest battery charge before shutdown)/mod chipset efficiency=maximum amps
Watts setting=what your watts are set to
Lowest battery charge on a regulated mod can be between 3.0v to about 3.6 3.7 volts per battery. Single battery or batteries in parallel (both positives up) config would be voltage of single battery, 3.2 generally the average, in a series (1 up positive 1 down positive, or 2 up 1 down, etc) voltage is multiplied by the number of batteries (dual would be example 6.4 (3.2x2) triple would be 9.6 (3.2x3)
Mod chipset varies but using 90% is about average, Dna200 for example has about a 98% efficiency
So dual battery at 100watts
(100/6.4)/90%=17.3611amps
Triple battery same setting
(100/9.6)/90%=11.5741amps
Not very hard simple algebra and a calculator, just fill the variables listed above and you can calculate them all day.
Mech best to use the above formula
Regulated you can about figure your max watts as so
20amps = 60 watts per battery max
25amps = 75 watts max per battery
30amps = 90 watts max per battery
No battery with higher than 30amps CDR (LG HB series) on the market in 18650 form, any battery says higher than that is a lie and rewrap, Sony, LG, and Samsung have yet to break that 30amp ceiling nor packing high amps and mah together
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