I think I finally understand ohms law....please confirm lol

[BreadVape]

hi all

Been vaping for a couple months now, started with an MVP I taste 3.0 with an atty cubed 3 and I've recently purchased the realuex rx200 - now usually my builds have been around 0.3ohms and the guts in my local shop have informed me this is fine, I installed some Clapton coils and it is reading 0.32 which again I know is fine, I did have a verticle coil build with tiger wire which again was around 0.3 but I bought some new quad twisted comp wire coils and have don't the vertical coils again but this time the resistance is reading between 0.16-0.18, here's the question....I know my realuex will handle 35amps but my MVP only 17amps but after checking the calculator at 60w I think it was saying the amps would be 19 so does this mean it is unsafe? I feel quite stupid because I had a few tokes with my MVP not realising that because of the ohms law it was in fact unsafe to vape using it at the 60w but at least I think I have finally cracked it! Didn't realise it was so simple but I just wanted that confirmed for me because it has taken me a while to work it all out

 

[ElevenEleven]

Since you're using regulated mods you won't have to worry about amperage too much. Your mods will let you know if something's wrong, just make sure to use the correct batteries for your RX. Do what you're comfortable with. Other than that, you nailed it.

 

[BreadVape]

Thank you for clearing that up, yes the batteries are 18650 (bought from the shop with the mod) and have checked and they are the recommended ones, I was just a little worried you see as the guy In the shop warned me about "when things go bad" so I did a ton of reading and still didn't quite understand and every time I vaped I always had the worry of it blowing up in my face niggling away haha but I think I'm finally there, thanks again

 

[Susan~S]

The MVP 3.0 will not fire anything below 0.2Ω (per the specs). And it for some reason it does, it's not safe to fire that low (exceeds the amp rate).

In a regulated mod the current from each battery is determined using the formula Max Amps = Max Wattage / Min Battery Voltage.

So with your Realeux 200, three batteries in series and 3.0V/battery minimum
Max Amps = 200W / 9.0V= 22.2A
Since they're in series each battery has 22.2A drawn from it.

Your 35A "re-wrap" cells are most likely 20A CDR (continuous discharge rating). Safe up until around 175 watts or so in the Realeux.

Here are links to some of Mooch's battery blogs:

• There are no 18650 batteries with a genuine rating over 30A!
• Battery pulse ratings are useless!
• 18650 Safety Grades -- Picking a Safe Battery to Vape With
• Links to all his battery tests to date: List of My Battery Tests

 

[BreadVape]

Like I said I feel so stupid knowing that I did fire it.....but like you say it's stupid that it does indeed fire it when in fact it shouldn't, but at least I know now and this is exactly why this forum is great, any worries and I have them seen to pretty quickly so thank you

So are you saying about the batteries when calculating my ohms I should stay under the 22amps rather than 35? Even though I checked that to use 35amps I would have to go ridiculously high which just isn't ever going to happen

I shall take a look at the links so thanks for sharing

 

[Susan~S]

So are you saying about the batteries when calculating my ohms I should stay under the 22amps rather than 35?

What I'm saying is that your cells are not 35A CDR. The are most likely 20A CDR (35A pulse).

There are only a few battery manufacturers in the world who make their own "cells", including LG, Panasonic, Samsung, Sanyo, and Sony.

All the other brands on the market buy the second and third tier cells from those manufacturers and re-wrap them under their own brand. These are "second and/or third tier cells" which did not meet the higher standards of the original manufacturer. So, in order to compete with the original manufacturers' batteries (first tier), these other companies feel obligated to publish specifications which are inflated to make them appear superior to those of the original manufacturer.

* (AW is Andrew Wan, a former Panasonic employee who branched out to create his own "brand" of batteries. He allegedly has agreements with the major cell manufacturers to purchase first tier batteries from them. Not all batteries are created equal, so AW tests these batteries for quality. The best get chosen to be AW brand, and are re-wrapped as AW.)

Efest, MOJO, AWT, Basen, Eizfan, IMRen, Sub-ohm Cell, Vamped, Vappower are all re-wrap resellers that are buying these "second and/or third tier cells" (sometime referred to as "B & C bin discards"). They print the "pulse discharge rating" on the label and pass it off as their CDR (continuous discharge rating). They often charge double what the authentic is worth.

 

[BreadVape]

Ahh ok that makes sense then as to why my batteries have a sticker on them with the information, my friend said because they are green they are most probably Samsung and now it makes total sense that these are in fact like you say second or third tier, you learn something new everyday

 

[IMFire3605]

Like I said I feel so stupid knowing that I did fire it.....but like you say it's stupid that it does indeed fire it when in fact it shouldn't, but at least I know now and this is exactly why this forum is great, any worries and I have them seen to pretty quickly so thank you

So are you saying about the batteries when calculating my ohms I should stay under the 22amps rather than 35? Even though I checked that to use 35amps I would have to go ridiculously high which just isn't ever going to happen

I shall take a look at the links so thanks for sharing

There are only 2 batteries on the market that are 30amp Continuous Discharge Rated, nothing else on the market above these, any that say they are 35amp plus Like Efest, are re-wrapped b and c bin discards (the batteries that didn't make snuff with the big manufacturers (Panasonic, Sony, LG, Samsung), the rating on the Efest is in fact the Pulse Discharge Rating of the authentic cells, example LG HE4, 2500mah, 20amp CDR, 35amp PDR.

The RX200 if you are 150watts plus, here is the list of batteries that are safest for it

Sony VTC3 - 1600mah, 30amp True CDR
LG HB6 - 1500mah, 30amp True CDR
Sony VTC4 - 2100mah, 20 to 25amp True CDR, capable of holding and sustaining 30amp CDR
Samsung 25R - 2500mah, 20amp True CDR, capable of holding 25amp CDR
LG HE2/HE4 - 2500mah, 20amp True CDR, capable of holding 25amp CDR (most times you'll find these on the wrap of a Sub-Ohm Cell Brand)

 

[Rabbit Slayer]

I know my realuex will handle 35amps

The website says to use 25A batteries or better....where did you get 35A from?

 

[BreadVape]

The website says to use 25A batteries or better....where did you get 35A from?

Google in hindsight I didn't follow my own advice....never trust google

 

[BreadVape]

It's scary to think of how much could actually go wrong with vaping!

Im still worried about my 0.15ohm build because technically 80w would put out 22amps and with whats been said about batteries this would my limit if not higher? That correct? Sorry to always ask but need to make sure as i value my face......

 

[IMFire3605]

To put it into a similar perspective, 0.15 ohms on a mechanical without regulation would be between 29 to 30amps. However if worried about the amp draw, you should have no issues with using Sony VTC4's or Samsung 25R's in your exact situation. Sony VTC3's or LG HB6's would be best, but they sacrifice mAh run time for pure amps where the VTC4 and 25R allow a little more wiggle room or both mAh and high amp discharge. As gramps always preached, use the right tool for the right job, in this case, batteries, use the right battery for your particular application.

HTH

 

[BreadVape]

Thank you, it ls just the first time my ohms have been that low so wanted to triple check haha and yes mine are samsung 25r (even though they are 2nd or 3rd tier like what was suggested yesterday) im going to look into purchasing some genuine (top tier) which will give me abit more peace of mind, thanks again