Please help massively confused by mixed advice

[Mark M]

Dear Everyone

I really need some expert help for peace of mind on safety please, I'm new to building coils etc and am using a Wotofo Profile BF RDA on a regulated Vicious Ant SX485j, single 18650 Squonk - my first squonk.

I have just got used to building the decks after a couple of tries and love using it. I vape at 45 Watts on a 18650 2500 3.7 battery.

I have purchased a load of mesh coils now, and wicks, and was really happy to crack on, I was concerned that sometimes the ohms tester reader said as low as 15 and as high as 20. But on the newcomer's forum, I asked about this and was assured by a member that as long as I am between 0.1 and 0.2 I'm fine.

But when I told the person that shipped me the mod he said "I'll say that the resistance of your build is quite low, and you are pushing that battery quite close to the continuous discharge safety rating. I would feel more comfortable if you used a more powerful battery such as a Sony VTC5A, and used a slightly higher coil resistance. I was never a fan of that Wotofo atomizer due to its huge power requirements. It's inefficient and unnecessary."

The problem is they only make .18ohm mesh coils for the profile, and I have a load now, like the setup and don't feel ready to start doing harder builds. And would really like to stick with this setup. There is another mesh from a third party but they are .13ohms so even lower.

I then researched and read a post on here about "continuous discharge", someone that seemed experienced saying "Anyone who is sub-ohming below 0.2 ohms are operating on the pulse rating, and are operating over spec for any 18650 battery currently on the market." (this was posted from 2014) So now I'm really worried. Please, can you let me know your thoughts?

Im not an expert at all, and was just told it was fine for my mod by a local shop and aim for between .17 and .19 ohms and use at 40 to 60 watt and I would be safe. It sounds like this may not now be the case. at all, please advise, as mentioned I vape at 45 Watts currently on this setup, don't want to swap but safety first. many many thanks, MArk

thanks,
Mark

 

[diagrammatiks]

The guy you are talking to doesn’t know what he is talking about.

You using a regulated mod. Only the wattage matters not the coil resistance.

 

[Mark M]

The guy you are talking to doesn’t know what he is talking about.

You using a regulated mod. Only the wattage matters not the coil resistance.

Thanks, which guy, the one I brought it from said im pushing the limits? What about quote from other person on here mentioning shouldn't use an 18650 at best than 2ohms?

so anyway does that mean im ok as long as I stick to 45 50 watts and the coil is fine between 0.1 and 0.2? I'm averaging around 0.15 ohms to 0.20 ohms.

Safety on mod is:

Self-adjusting 510 Connection Single 18650 Battery Configuration Sx485j chipset 304 Stainless Steel Battery Cap, Switch and Frame T7 Aerospace-graded Aluminum body Joystick Controller Cerakoted Finish Carbon Fiber Door Laser-engraved Silver-Plated Positive Contacts

Many thanks,

Mark

 

[Eskie]

Nice mod. Should be fine with your mesh coil although others do find it necessary to run at slightly higher wattage. But if it's a good vape for you that's all that matters.

Using a quality battery from one of the name brand companies still matters, even in a regulated mod. The VTC5A you were pointed to us an excellent battery with a CDR of 25A and 2,500 mAh. The description of your current battery as 18650 2500 3.7 battery is generic and doesn't identify the battery itself at all. If there's supposed to be a link associated with that it's not working.

Using rewrapped batteries from third party rewrapers is fraught with problems. You have no idea what the actual battery is underneath that wrap and specs may and are inflated to make sales. Stick with batteries from reliable vendors like IMR or Illum or RTD if you're in the US and stick genuine batteries from Sony, Samsung and LG. A quality battery with a 20A CDR or higher is perfectly fine in that mod at 45W.

 

[dreamvaper]

Vicious Ant SX485j, single 18650 Squonk - my first squonk

almost a £300 for your first squonk? this one def. deserves the high q. batteries from a reputable vendor.

if you're in the US

London, Ohio

 

[greek mule]

@Mark M in your previous Thread in Just got my first squonk!! Took 8 tried to build a coil lol me and other members already assist you,answering to the very same questions you repeated here.

You are using a regulated mod,so don't mind for resistance,it's irrelevant.You use Samsung 25R 20A CDR 18650 battery.You can safely hit 55 watts.

If you buy a Sony VTC5a 25A CDR 18650 battery you can reach 75 Watts.

The person that shipped you the mod,thought you own an unregulated device.

If your mod was unregulated then resistance becomes relevant and the lower it is, the larger amount of Amps that it draws from battery.

Example: I=V/R (formula to calculate current draw at unregulated mods)

Your resistance is 0.18 ohm V=voltage at a full charge battery -i.e. 4.2 volt

Amp draw= V/R <=> Amp draw= 4.2/0.18 <=> Amp draw= 23.33 Ampere.

In this case you had to use vtc5a 25 cdr battery.
But your mod is regulated and this formula doesn't apply.
It is the CPU whice desides how much current must draw from battery in order to produce the selected wattage.

No matter if your resistance is 0.1 or 0.2 or 0.4 ohm.
You can calculate current draw using this formula:I=P/V/0.9

P= the selected wattage
V=cutoff voltage (usually 3.2 volt)
0.9=cpu average efficiency

You said you vape at 45 watt therefore:

I=P/V/0.9 <=>I= 45/3.2/0.9 <=> I= 15.62 ampere

Cheers

 

[Punk In Drublic]

@Mark M – Just to clarify, 3.7v is not the battery voltage. That is a nominal voltage, meaning the battery operates within the range of 3.7 volts for the longest during it’s use. The max voltage of an 18650 cell is 4.2 volts

And to elaborate on @greek mule above post.

With a regulated device think of it as 2 sides. An input side from the battery and a output side to the coil. The battery on the input side does not see the output side of the coil…..it has no idea what resistance you are using. It only sees the power that is being requested of it - which in your case is 45 watts. As your battery starts to drain, the voltage drops – so in order to meet your requested power more current is needed.

As demonstrated above we can calculate what that current draw is.

Here’s a video from Battery Mooch that goes into detail plus a little info on battery safety. I highly suggest checking out other videos within his channel.

 

[Old Greybeard]

As others have mentioned, and @Mooch has clearly stated in his videos, the rules for unregulated mods are totally different from regulated ones concerning coil resistance, current draw etc.

A regulated mod should protect you against short circuits, drawing too much current etc. An unregulated mod has no protection whatsoever, so it is totally up to the user to ensure the battery capacity is not exceeded.

That said, and I 110% agree with mooch on this, is that while regulated mods are safe 99.99% of the time, it is prudent to consider the 0.01% as well, taking into account how much damage a failed battery can cause to either you or your environment. Yes, you can use 20A CDR batteries up to 45-55W, but you will probably suffer from a) Only being able to vape for ½ a day or so, b) The batteries will have a shorter charge/discharge life as they are running close to their maximum rating and c) If you chain vape you might not get as good a hit. As mentioned previously, Samsung 20S's or an equivalent 30A CDR battery would suit your vaping style better as they give you so much more leeway.

Think of it this way. If you had to overtake a very long, slow moving truck on a notoriously dangerous bit of road, would you rather do it with a slow, fully laden car that struggles to get up to that speed or a light, fast motorbike that can easily exceed the speed limit?

I haven't come across any incidents yet where a regulated mod has catastrophically failed due to low resistance coils. Others may know differently, AFAIK the only regulated failures seem to have occured when people have charged the batteries in the mod, rather than on a separate charger. That said, nothing in life is guaranteed, and personally, I'd rather err on the side of caution and spend an extra few pounds on high capacity batteries, rather than worrying if my coil builds are too low.