Vaping safety and batteries

[Altair49]

Hi guys,

first off thanks for all replies on my other two threads, the info helped me work out my initial issues wonderfully!

So I have been using started kits for six months, and everytime I would go into a vape shop they would have something new and I would go ooooh I want that, now I have a Boxer 250 in classic167 case, a sxmini G Class, Lost Vape Therion, Paranormal, and an ePetite on the way. Plus 8 different tanks/rdas/rdtas....

I have been enjoying the move from ready made tanks to actually building my tanks and rda with premade coils (no interest in wrapping coils myself) but I am concerned about battery safety.

I am not sure what amp or watts to limit myself to. I understand batteries need to be reviewed and tested for actual amp rating, so lets say I have a pair of efest 18650 rated at 35 amps with the true rating at 20, is it ok for example to run my build of a 0.2 ohm dual coil?

I know of the steam engine ohms law calculator, and have done the safety calculations, but what should be my limit? does it only depend on the battery amp rating or does the build ohm come into play?

 

[bombastinator]

Are any of your mods mechs? If not your mod will take care of most of that for you.

As for the buying stuff problem I suggest the shineyitis support group.

 

[untar]

For a regulated 2 battery mod you calculate the max load on batteries
max power/(2*lowest allowed voltage)
so e.g. for 200W and a cutoff at 3.2V in your mod you'd need a 200W/(2*3.2V)= 31.25A CRD battery to be safe.
By rearranging you can calculate your max power based on the max amps 20A*(2*3.2V)= 128W max power for dual 20A batteries in a regulated mod. That is if you want to stay in the "safe" zone layed out by battery gurus.

The resistance is futile ... err, I mean not important, the load on the battery side is.

 

[Altair49]

what? 200W? I peaked at 70 and afraid of going to 80!

I must be misunderstanding something here. For example, I have a boxer in my hand right now with a vandy vape kylin rinning a dual coil .16ohm build, vaping at 55w, my mod says this is putting 18.4a load on the batteries (pair of eferest 3000mah 35a'a, true rating of 20A as I understand)

From what I gather I am at the limit of this setup, or can I go higher safely?

 

[Altair49]

also, what is this 3.2v cutoff? my mods all go beyong 4v, how would i know whats a safe cutoff and where to draw the line on whats?

Aghh this is so confusing

 

[untar]

Well, let's dew the maths...
55W/(2*3.2V) = 8.6-ish Amp (per battery) and 17.2-ish Amp total. If you calculate in losses in the mod then you can easily go up to 18.4A (I'd even say that's preeetty good efficiency). Note that I don't need the resistance to calculate any of that at all. It simply doesn't matter, what matters is how much amps the board needs to draw from the batteries. Look at my last post to see the max power you can go up to with your batteries. If you want it superduper safe you can assume a 10% power loss and then "only" go up to 116W instead of 128W. This is plenty enough for most purposes.

The cutoff is the voltage your mod regards batteries as "empty". For DNA boards that's a 3.2V preset, afaik the boxer has a DNA chip in its entrails. Some SMOK mods have a 2.8V preset and that would change the calculations.

 

[Topwater Elvis]

The amp value displayed on the screen is a worthless output amps (from chip/board to delivery device) not input amps (from batteries to chip/board).
Output = power going to delivery device.
Input = battery amp demand.

Low voltage cutoff (3v - 3.2v cutoff) is the voltage your power device drains the batteries to and as a results stops firing. low voltage cut off some devices cutoff at 2.8v some at 3.4v - 3.5vish.
When using a regulated power device battery amp demand will be highest just before & at the low voltage cut off.

The problem with 're wrap' cells is no one can say for certain what cell is used at any given time under the wrap, they can & frequently do change what cells they use.

 

[Altair49]

what a wonderful community! Thanks guys, that clears up allot!

so i divide the amps by the number of batteries? D'OH!

Assuming my batteries are rated at 20a true rating, what would you say is the max watts I can go to safely in my above example?

 

[Topwater Elvis]

I wouldn't assume anything about re wrap cells...
Everyone has to determine their own personal safety / comfort levels, I don't use rewrap cells at all, if I did I'd treat all of them as 10a CDR, for safeties sake.

Batteries are inexpensive and the most important part of vaping safely.
Always best to use authentic name brand cells bought from a reputable source.

 

[Altair49]

gotcha, will do.

So whats the absolute best batteries to buy? and who sells them?

 

[Topwater Elvis]

Depends on what cell you need, where in the world you are and if a reputable cell source ships to wherever that is.

Samsung
LG
Sony

I buy mine here ---> Batteries and Chargers

 

[untar]

I guess "KSA" = Kingdom of Saudi Arabia?
Sorry, can't help you with trusted suppliers there.

 

[Altair49]

yes, ksa. I can buy online. Will stick to max 60 wats for now.

Thanks again guys, I really appreciate the time you guys put in to help us noobs not ignite!

 

[bombastinator]

This blog may help you find which batteries you want
Mooch's blog | E-Cigarette Forum

 

[stols001]

I wouldn't make any assumptions about rewrapped batteries either, and I see 10A as a good starting place. You don't know what they are, so assume the worst case scenario. An overstressed battery is an unhappy battery, mech or not.

I would check out Mooch's blog and/or maybe ask in the EU forums where you can obtain authentic batteries easily and reliably. You may find a vendor much nearer your location, with better prices, than buying from the US and shipping to France. That would be my recommendation in order to obtain some authentic batteries more quickly.

And yes, you want to "calculate" safely for your regulated mod, so that is going to depend on your wattage needs. That is, really, dependent on what you build, since higher resistance coils generally require less wattage. So you might want to get some higher resistance coils, for until you are able to get authentic batteries where you really will know what you can "assume" to be true. Best of luck.

Anna

 

[untar]

shipping to France

France? did I miss something or do you think France is anywhere near Saudi Arabia?
And there I thought all our jokes about muricans and geography were exaggerated

 

[Baditude]

So whats the absolute best batteries to buy? and who sells them?

Being that you are in Saudi Arabia, you'll probably want to order from a supplier in Europe.

www.nkon.nl
Welcome to Ecolux. The UK's Battery and accessory specialists. Wide range of authentic leading brands in stock ready for immediate dispatch.
​

Lg, Samsung, and Sony make the absolute best batteries in the world. Good way to remember is that they all make televisions. All the other battery brands are considered aftermarket companies. They rewrap the rejects of Lg/Samsung/Sony or use cheapo Chinese-made batteries and exagerate the battery specifications...like Efest does.

Are You Using a Rewrap (Rebranded) Battery?
Purple Efest Batteries Not As Advertised​

So, here are the recommended batteries from Lg, Samsung, and Sony:

Samsung 18650 30Q, 3000 mah 15/ amp CDR

Sony 18659VTC6 3000mAh 15/ amp CDR

AW 18650 3000 mah 20 amp CDR

LG 18650HG2 3000mah 20 amp CDR

Sony 18650VTC5, 2600 mah 20 amp CDR

LG 18650HE4 2500 mah 20 amp CDR

Samsung 18650-25R, 2500 mah 20 amp CDR

(there is a blue wrapped 25R with identical specs)
Sony 18650VTC4, 2100 mah 23 amp CDR

Sony 18650VTC5A, 2500 mah 25 amp CDR

LG18650HB6 1500mah 30 amp CDR

LG18650HB2 1500mAh 30 amp CDR

LG18650HB4 1500mAh 30 amp CDR

Sony 18650VTC3 1500mAh 30 amp CDR

​

WATTAGE PER SINGLE BATTERY:
20W-45W:

Samsung 18650 30Q, 3000 mah 15 amp CDR
Sony 18650VTC6 3000mAh 15 amp CDR​

20W-60W:

LG 18650HG2 2000mah 20 amp CDR
LG 18650HE2 2500 mah 20 amp CDR
Samsung 18650-25R, 2500 mah 20 amp CDR
Sony 18650VTC5, 2600 mah 20 amp CDR
Sony 18650VTC4, 2100 mah 23 amp CDR
AW 18650 3000 mah 20 amp CDR​

30W - 75W:

LG 18650 HD4 2100 mah 25 amp CDR
LG 18650 HD2 2000 mah 25 amp CDR
Sony 18650VTC5A, 2500 mah 25 amp CDR​

60W - 90W:

LG18650HB6 1500mah 30 amp CDR
LG18650HB2 1500mAh 30 amp CDR
LG18650HB4 1500mAh 30 amp CDR
​

 

[stols001]

I have no idea where that location came from and why I was thinking France. Maybe it was a previous post I was reading. My apologies. I still think you may want EU suppliers, it should be quicker, and you've gotten some good advice for suppliers.. Sorry about my error.

Anna