Maximising battery life on my single 18650/smaller devices.

[sofarsogood]

Hi @sofarsogood-I notice that you mention the Evic VTC mini can tell you how many seconds you are actually vaping for per day.

I have no idea how many seconds I actually use any of my devices for, but I do own the Evic VTC Mini. How do I get up the second counter onto the display?

I am not too sure where the instructions are if I am honest, I have looked in my ottoman, but there is a lot of boxes and various vaping related items in there, it would be handy to know a rough estimate of how long I am actually vaping for per day, on a build suited for maximising battery life (I run many different tanks and RDA's with different builds on different mods, but when it comes to my single 18650 powered mods, I do try to stick to something similar to get the best I can from them).

Thanks, and all the best, Conan.

You can find the complete documentation as a pdf on the company website. It's good to keep track of the number of ml and firing time per day. Over months I was at 1000 seconds a day. Recently I seem to have escalated to 1200. I tried reducing nic from12 mg to 10. The next batch I'm going back to 12 to see if that reduces firing time. I'd rather be vaping less ml than less nic.

 

[sparkky1]

That's only true if you use the same gauge wire.
Wrap that same higher resistance with say 36 gauge wire and it will probably heat up faster than you can control.

Also ohms law is a circle, and no one factor is more important than the other three. If you change one factor ... you will change all 4.

However amperage draw is the ONLY factor that determines how long a battery charge lasts.
At 2 amps a 18650 will easily last all day. At 20 amps you will reduce that time by a magnitude of 10.

Amperage draw is determined ONLY by watts, nowhere is ohms law factored for max CDR through a PCB regulator, to get your "optimum" results for any given ohm / gauge coil, a seasoned builder would run the numbers for heat flux with watts applied to achieve this ..............

 

[tj99959]

Amperage draw is determined ONLY by watts, nowhere is ohms law factored for max CDR through a PCB regulator, to get your "optimum" results for any given ohm / gauge coil, a seasoned builder would run the numbers for heat flux with watts applied to achieve this ..............

No-no, a seasoned builder KNOWS what ohms-volts-amps gives them the watts needed for the heat flux they want. ... just sayin'

BUT ... that has nothing to do with figuring how long the battery charge will last.
A batteries charge life is measured in mAh, and nothing else. The more amps you draw .. the faster you deplete the battery. So if you want longer battery life, figure out how to get the "heat flux" you want at a lower amperage.

 

[sofarsogood]

Amperage draw is determined ONLY by watts, nowhere is ohms law factored for max CDR through a PCB regulator, to get your "optimum" results for any given ohm / gauge coil, a seasoned builder would run the numbers for heat flux with watts applied to achieve this ..............

I believe amps go up as voltage goes down. Referring to Watt's law the evic vtc mini cutoff voltage is 3.1 and a 25 amp battery is recommended. That's because 75 max watts / 3.1 volts = 24 amps. When the battery is fully charged and operating at peak voltage the amp draw at 75 watts is less.

 

[ppeeble]

Well i'll throw this in.... Using a kayfun light with a 1.7ohm coil (8 wraps of .28 kanthal) @ 13 watts (4.7v) on a Provari 3 i've managed to get a full days vaping out of a TRUSTFIRE 18500. That's about 4.5ml of e-liquid.
Conversely i get around 2 hours vaping from a Samsung 25r in my D2 with a dual coil Bellus at 0.3ohm, 26w (3v)....

 

[AzPlumber]

BUT ... that has nothing to do with figuring how long the battery charge will last.
A batteries charge life is measured in mAh, and nothing else. The more amps you draw .. the faster you deplete the battery. So if you want longer battery life, figure out how to get the "heat flux" you want at a lower amperage.

Aside from mAh, batteries can also be measured in watt hour (wh)

 

[sparkky1]

Wouldn't it just be a little easier not having to work with 32 - 28g and worry about every second vaped, instead, just install another $5 battery ?

 

[conanthewarrior]

You can find the complete documentation as a pdf on the company website. It's good to keep track of the number of ml and firing time per day. Over months I was at 1000 seconds a day. Recently I seem to have escalated to 1200. I tried reducing nic from12 mg to 10. The next batch I'm going back to 12 to see if that reduces firing time. I'd rather be vaping less ml than less nic.

Thank you-I now have the manual again . I like having manuals-they are very handy, I am quite surprised at some questions I have had, knowing full well the answer is in the manual, as I have read it for the device the person is questioning me about. (I know I did ask you a question there that IS in the manual-thank you for letting me know where to get a copy of the manual though, much better, just read how to do it).

I will have to find out how many seconds I am actually using a device for a day, it will be good to know. EDIT: Since owning the device, it looks like it has clocked up 21,428 seconds of use, it gets used in rotation though out of many devices, so if used alone it would most definitely be a lot higher. It is also good, as on the cuboid I can do the same, and see how the increase in W/h's affects runtime for myself.

I seem to have got a build I like, that works very well at just 14 watts. It is single coil, but that is all I need for my requirements.

Thank you all for your help, Conan.