Smoktech ZMax Owners - Pics., Tips, Tricks and Quirks

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Kcfromva

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All I can find is aw imr 18350 specs that say the lowest discharge voltage is 2.50V. If that is true there should be little concern unless the zmax would run on 5v.

So the 18650 fully charged is 4.2ish and 18350 lowest x2 is 5.0, so the zmax would be able to recognized the difference. That makes sense to me. Does that sound right? I could just use 1 battery and no worries then I guess.
 

dwcraig1

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I finally got a proper SS mesh coil in my DID clone, it's 1.5 ohm. On Zmax set to 3 watts with stacked batteries it has no burnt taste, with stacked batteries set to 3 volts it is burnt tasting after the second hit or so. With the single battery @ 3volts it is good. This is all preliminary on my part as mesh is something that I'm still triyng to master but have made great progress.
EDIT: My purpose for this is to show that your existing LR stuff that could not be used on Vmax even as low as 3 volts can be used on the Zmax
 
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jackbox

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Only one real way to test it. Will place two 18350 imr's in at 3.4v each and see when/if the zmax cuts off use at 6.4v or not. If not, then her concerns are warranted.

She is saying if someone discharges the batteries below 2 volts outside of the PV and then puts them in the ZMax it will think they are a single 18650 and have problems. I think this scenario is not an issue for most reasonably safe users. Nobody should be using their batteries in such a way as to discharge them that low anyway. I always make sure my batteries are fully charged before putting them in any mod.
 

Morandir835

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True Jackbox sir, but the low battery indicator with a single 18650 kicks on right around 3.4v, then the same indicator should kick on at 6.8v or so with the dual 18350's (which it hasn't thus far in all my runs, 6.8v is always where I stop and switch batts though, so never taken it lower). Yes the 18350 batts are rated to run to 2.5v, but don't know anyone who would suggest running them lower than 3.2v, especially in a stacked fashion.
 

jackbox

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True Jackbox sir, but the low battery indicator with a single 18650 kicks on right around 3.4v, then the same indicator should kick on at 6.8v or so with the dual 18350's (which it hasn't thus far in all my runs, 6.8v is always where I stop and switch batts though, so never taken it lower). Yes the 18350 batts are rated to run to 2.5v, but don't know anyone who would suggest running them lower than 3.2v, especially in a stacked fashion.

I totally agree with you. Was just trying to explain her logic; which I personally don't agree with. I think her worries are totally unfounded unless the person using it was totally ignorant of how to deal with their Li-Ion batteries. The first thing anyone new to vaping with mods should do is to read and understand the many battery primers available on this forum and the internet.
 
So ive received my zmax and am having fun with the vari watt setting that im not used 2 yet..i have always been a vari volt vapor, so i cranked it up to 8 watts and after a couple drags i start to get a burnt carto taste, 6.5 watts seems to keep it nice as a 5 volt vape would feel on my provari...anyone else notice this? My setup is a glass tank and 3ohm..wondering how many watts others are using...thanks
 

jackbox

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The more I think about it, the more I think this is impossible.
I think the post from c9v is completely alarmist and totally unwarranted.

Li-Ion lower cut off voltage is 2.75 volts. If they don't have an internal protection circuit and go below this they will become unusable. The voltage will drop to close to zero and they won't accept a charge. So what she is proposing is in practical theory nearly impossible, IMO. I agree with you.

Here is the warning printed from the side of one of my 18350 Li-Ion batteries. These are unprotected cells. I have personally never seen a protected 18350 battery.

rps20120924_165242_808.jpg
 
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AnsonJames

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So can someone with a zmax run a stacked setup until shutdown? Then check voltage and report back here. That should settle it. If below 2.5 then there is a chance but I can not believe it will go that low before shutoff.

The shut off would be the same as the Vmax - 3.1/2 per battery.
 

jackbox

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Not with stacked batteries.
Cutoff with the 18650 should be around 3.2 to 3.4 volts

It is sort of like the guy with the stripped batteries video. The lady is being an alarmist and putting out false warning based on lack of knowledge of Li-Ion batteries. She means well but she is scaring people with unfounded claims. Everyone can make their own informed decisions based on facts and doing a little research on their own.

The scenario she proposes is possible but kind of ridiculous. She is saying that someone could use the the 18350 in another device (I guess without undervoltage protection) and run the batteries below two volts. Then the two stacked batteries would like like one 18350 battery based on voltage and the ZMax would run them down further. My contention is that if you get an 18350 battery down below two volts the battery is toast anyway, would drop to zero volts and would no longer function or charge.
 
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Morandir835

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My worry isn't about the batteries running down to 5v or below and still being able to run, but if it will allow you to even take it to that point. If it cuts off at 6.2-6.4v just like the vmax, then even if you put in two 18350's drained to their lowest safe voltage (2.5v), have a feeling it wouldn't work either. If someone has already ran their batteries to that low a voltage (2.1v) they've already put themselves at risk for a venting incident before they even put the batteries into the zmax.
 

AnsonJames

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So I think the general consensus is the the CV9 person is talking bollocks - as we say in Ireland.

You'd need to put the batteries in a purely mechanical mod and vape past the point where it feels like you're sucking on a straw and then some.

Not happening and nothing to worry about.
 
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retird

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From reading her safety issue info, it seems she has based her concerns on the testing she did....and you are correct that we should research also....please let us know what tests and research you base your contentions on...I'd like to know....after all, I'm researching...and I have a question for those who have a Zmax.....did it come with instructions that included detailed information concerning proper use of batteries and batteries that should be used (or batteries that should not be used)?

I have been researching batt safety for a while now, and also have seen graphic pics of the results of several exploding mods, and have read the resulting law suits. Not a pretty site...I, for one, will not minimize the need for safely designed mods.....at least that is my opinion....I'm not calling anyone out here, just saying.....

It is sort of like the guy with the stripped batteries video. The lady is being an alarmist and putting out false warning based on lack of knowledge of Li-Ion batteries. She means well but she is scaring people with unfounded claims. Everyone can make their own informed decisions based on facts and doing a little research on their own.

The scenario she proposes is possible but kind of ridiculous. She is saying that someone could use the the 18350 in another device (I guess without undervoltage protection) and run the batteries below two volts. Then the two stacked batteries would like like one 18350 battery based on voltage and the ZMax would run them down further. My contention is that if you get an 18350 battery down below two volts the battery is toast anyway, would drop to zero volts and would no longer function or charge.
 
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jackbox

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She said if someone ran their batteries down below two volts outside of the ZMax and then put them in the ZMax without charging them there is a potential for the problem she claims. But as Morandir835 said if you do that you are going to have trouble before you ever think about putting them in the ZMax. It is far-fetched that someone would run them so low and try to use them in another device without charging. Also my brother stupidly did run down two unprotected 18350 batteries in a mechanical mod too low. They started venting and his mod got hot and he dropped it. Since it was vented the batteries vented with no explosion, and the batteries were toast. I agree with Morandir835, that you will have venting issues well before you get around to putting the batteries in your ZMax under her proposed conditions. Here is what his batteries looked like after the venting. This is why you don't use unprotected batteries in a mechanical mod. He'll never do that again. Lucky nothing really bad happened.

vented_battery.jpg
 

AnsonJames

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There's instructions but they're in Chinglish, they do say that you should use IMR's.

I assume that if you've gone to the trouble of buying a mod on the basis it has a variable wattage feature, buying the additional end cap,etc then you're not the sort of person that would allow your batteries to drain that low.

If there's a risk, it's tenuous at the very best.
The original post from CV9 doesn't really go into her testing methods, sounds almost like a warning based on speculation.

There's obviously something on the board that checks for voltage and adjusts the output to buck or boost, I'd imagine if it detects 4.1 volts or lower it'll switch to boost for the 18650. Even if it switches to boost beyond that voltage, i.e.- 4.6 volts, it would still mean that your 18350's would have to be drained to 2.3 volts in order to fool the device.

If you're only using your 18350's in the Zmax or Vmax, the unit stops "bucking" at 6.2 volts so your batteries wouldn't drop that low anyway.
 
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