Again, you can vape safely at 100W in a 2 cell mod with 18A-20A batteries. Each battery is responsible for half of the wattage so 50W each battery. The cutoff voltage for your mod should be 3.2V so divide 50W/3.2V = 15.625A. Factor in the efficiency of the mod which I usually like err on the side of extra caution and say 90% so divide 15.625A/.9 = 17.36A being drawn from each cell when the baterries are at their "lowest". If you rework this equation with freshly charged batteries you get a much better result: 50W/4.2V = 11.9A, factor in your inefficiency 11.9/.9 = 13.22A. What this means is that we draw more current(amps) from the batteries in a regulated mod when they are closest to needing a recharge.
The article @Mooch suggested/wrote explains it very well. When we calculate the Max Amps Per Battery it is to find out how hard we're pushing them when they are closest to needing a recharge. I rarely go below 3.5V even though the cutoff on my regulated mod is 3.2V. This gives me a bit more room if I want to go above 100W with 2*20A cells. I dont, in fact Ive never been above 85W with this mod.
Edit:
Just wanted to add that if you just want a simple answer for a safe battery at 100-150W then yes, please use 25A batteries.
The article @Mooch suggested/wrote explains it very well. When we calculate the Max Amps Per Battery it is to find out how hard we're pushing them when they are closest to needing a recharge. I rarely go below 3.5V even though the cutoff on my regulated mod is 3.2V. This gives me a bit more room if I want to go above 100W with 2*20A cells. I dont, in fact Ive never been above 85W with this mod.
Edit:
Just wanted to add that if you just want a simple answer for a safe battery at 100-150W then yes, please use 25A batteries.
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