Why does Amps drop but go up in a mech vs regulated?

[conanthewarrior]

Hi people. A quick question regarding batteries, in mechs VS regulated decvices.

I have my first mech on the way, a Nemesis clone, as with all the talk of regulation I was advised to get one, so did.

Now, using varrious calculators, I get the same results. I mainly use the steam engine ones.

In a mech, I will be building no lower than 0.4, probably 0.5, which draw 10 and 8 amps respectively.

In the mech, as voltage drops, so does the amps. When the 0.5 coil starts at 8 amps, it drops to around 6 at 3.1 amps, where as in a regulated device, set to 30 watts, the higher the voltage, the lower the amp draw? As the battery drains, amp draw increases.

Slightly confused as to why this is, if someone could explain that would be great. It is probably so simple I will slap myself when I find out the answer lol.

Thanks to everyone that helps me, Conan.

PS I ordered an IPV D2, had to because of its size and the ti function. Found one shop in the UK that had some in stock, it will be sent out on Monday, so I should receive it on Tuesday. I can then directly compare the sig and the IPV myself. One is likely to become my ADV at a lower wattage in power mode, currently my sig75 takes that spot, but if the IPV performs as well in power mode, due to its size that will become my all day vape. I am also interested in stealth vapes, I have been looking at 18350 mods, how long does the battery last on average on one of these? Would it be enough for a 2 hour bus journey if I took a spare with me?
With a derringer on top, they are TINY.

 

[conanthewarrior]

Oh, I forgot to add, what 18350 or 18500 is best for me to go for? I have learnt about 18650's, but know nothing of these batteries and what to order. I would buy a set so one can be charged while the other is used.

 

[Slurp812]

Its because of the regulation. In order to maintain wattage, as voltage drops, current must go up. Power is equal to amps times volts. The regulators are of course not perfect, and when the battery gets drained, sometimes they cant keep up.

 

[Slurp812]

Smaller batteries wont last as long. The 18650 size is the most common, and easier to find and offer more options...

 

[f1r3b1rd]

Its ohms law and the way regulation works. Everything has to stay within its voltage and amperage limitation.
Watts is equal to voltage times current. So when you adjust one, the other has to change of you are keeping power and resistance constant.
Thats also why a 200w mod is not necessarily a true 200w mod unless you build within a certain parameter.

To your batteries... And here we go with limitations you have to figure what you want them to do and what limit you're willing to work with. I would not advise going below 1 ohm with an 18350.

 

[NemesisVaper]

As above. Some very nice detailed explanation. I especially enjoyed that ohms law chart, very useful and has everything you need on it.

A mech is a simple switch and connectors, so the load will pull what ever current it is able, depending on the voltage at the time. As voltage drops, flow drops and there's nothing a mech can do about it. The cell is the boss.

On a regulated device, the board is the boss. As flow drops (voltage) the board still wants what ever wattage you have set, so it simply takes it in a different form. Rather than (x) Volts and (y) amps to give (z) watts, it has to draw (a) Volts and (b) amps to still give (z) watts.

 

[Zamazam]

Oh, I forgot to add, what 18350 or 18500 is best for me to go for? I have learnt about 18650's, but know nothing of these batteries and what to order. I would buy a set so one can be charged while the other is used.

18350's are low ampere batteries, no more than 5 amps draw max. There are 18350's marketed with 10 amp listings, but that is bogus. The lowest I go on 18350's is .8 Ohms. With the 18490/18500 some go to 10 amps, but do your research before you buy. I have an Atimazoo Naval Brass Lab mech that uses 18500's and 18650's with an extender tube. I build .5 coils in my Vulcan RDA and use it regularly.

 

[conanthewarrior]

18350's are low ampere batteries, no more than 5 amps draw max. There are 18350's marketed with 10 amp listings, but that is bogus. The lowest I go on 18350's is .8 Ohms. With the 18490/18500 some go to 10 amps, but do your research before you buy. I have an Atimazoo Naval Brass Lab mech that uses 18500's and 18650's with an extender tube. I build .5 coils in my Vulcan RDA and use it regularly.

I was going to use a 1.0 coil on it, just for a real tiny vape as my mod that is coming has the tubes for 18650, 18500, and 18350, so thought I might as well get a couple for ultimate stealth lol