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Quiting Smoking, got on the "vape" kick — Parallax Forums

Quiting Smoking, got on the "vape" kick

TCTC Posts: 1,019
edited 2014-07-18 13:09 in General Discussion
Hello all,

I have decided to quit smoking. And to help me I am using a electronic cigarette (vape). My unit (mod as they call it) has adjustable voltage, and wattage.

But that is not why I am posting this thread. I have a couple questions that just don't make sense to me. And my own "mod" idea that uses a prop.

1) There is so much hype about the Sony IMR 18650, 2600mAh battery. People are calming it can discharge up to 30A (yes AMPS). Is that true? I can see places saying that just to sell them.

2) For the coils, does the resistance go up, or go down when nichrome heats up? (trying to determine battery life)


Now for the prop.

At a later date, I am going to build my own mod. I plan on using Newhaven's 2.4" TFT display Mostly for the WOW factor (I have been sitting on 3 of them for over a year now). But also to allow me to monitor the battery, the current output, the voltage output, etc... But I have a question, I want to be able to adjust the output voltage. Would I just build a simple DC-DC converter? I would think I would not have to worry about noise on the output, since it is just driving a coil that gets hot.

Thanks
TC
«1

Comments

  • OppaErichOppaErich Posts: 48
    edited 2014-07-10 04:29
    2) For the coils, does the resistance go up, or go down when nichrome heats up?
    Metals are "cold conductors", resistance goes up when temperature is raised. There may be one or two exceptions as always.

    Edit: Aha, this one is considered constant in resistance like many alloys.
  • TCTC Posts: 1,019
    edited 2014-07-10 04:51
    OppaErich wrote: »
    Metals are "cold conductors", resistance goes up when temperature is raised. There may be one or two exceptions as always.

    Edit: Aha, this one is considered constant in resistance like many alloys.

    So no matter how hot it gets, the resistance will stay the same?
  • LoopyBytelooseLoopyByteloose Posts: 12,537
    edited 2014-07-10 04:59
    NO... the resistance cold is the lowest and there is an 'in rush current' until it warms up.

    How hot it gets is a balance between the supplied voltage, the length of the wire, and its diameter. If the wire is too short or the diameter is too small for the voltage and current provided is relatively unlimited, the filament burns up. Get the right size and a balance is achieved.

    With lead acid battery chargers, they some times used a 12V brake light bulb between the battery and a trickle charger source. The cold filament would provide more current (and charge a dead battery faster), the hot filament would provide less.

    Capacitors also have an 'in rush' current until they reach full charge. This in-rush can be more severe that heating wires.
    Coils in electronics have the opposite ' an 'out-rush' that causes a nasty voltage spike when disconnected.

    +++++++++++
    Not sure what you have in mind for a simple "DC-DC" converter. Linear devices pretty much will filter out noise along with the regulation. Switching devices are not so clear to me, but they are a lot more efficient at extending battery life (92% or so, compared to 70% for linear regulators). Of course, a heat filament is not going to be affected by noise.
  • kwinnkwinn Posts: 8,697
    edited 2014-07-10 05:37
    Quitting smoking is a great idea. Wish you the best of luck with it.

    1) Can't find any trustworthy data on the sony battery but even if the 30 amp discharge rate is true it would only be able to sustain that for about 5 minutes before the battery was totally discharged.

    2) The resistance goes up slightly as the nichrome heats up, but only increases by about 6% or 10% (depending on alloy) at 2000 degrees F. See en.wikipedia.org/wiki/Nichrome.

    3) Noise is not a problem for a Nichrome heating element. It gets converted to heat, so a simple DC-DC is fine. Even a DC-AC converter would be fine, although it would be simpler to use a voltage that would produce the maximum desired temperature and PWM it for the lower temperatures.
  • TCTC Posts: 1,019
    edited 2014-07-10 05:45
    How hot it gets is a balance between the supplied voltage, the length of the wire, and its diameter. If the wire is too short or the diameter is too small for the voltage and current provided is relatively unlimited, the filament burns up. Get the right size and a balance is achieved.

    I have not made a coil as of yet, but people I have talked to suggest a 28AWG wire, wrapped around a 3/16' (or so) drill bit, about 7 times. That should make about a 1ohm coil. Again, this is only what I have heard, I have not confirmed it.

    With lead acid battery chargers, they some times used a 12V brake light bulb between the battery and a trickle charger source. The cold filament would provide more current (and charge a dead battery faster), the hot filament would provide less.

    Ahh, I remember those.

    Capacitors also have an 'in rush' current until they reach full charge. This in-rush can be more severe that heating wires.
    Coils in electronics have the opposite ' an 'out-rush' that causes a nasty voltage spike when disconnected.

    Could a heating coil have inductive kick? (out-rush)

    Not sure what you have in mind for a simple "DC-DC" converter. Linear devices pretty much will filter out noise along with the regulation. Switching devices are not so clear to me, but they are a lot more efficient at extending battery life (92% or so, compared to 70% for linear regulators). Of course, a heat filament is not going to be affected by noise.

    I only suggested DC-DC, because of the efficiency. I was planing to have 4 Li-on battery's, in a series parallel setup. That should provide me with up to 7.4V, with double the mAh. (Not saying I would use it). and if I run (2) 1ohm coils (.5ohms), that should be a max current of 14.8A. I would think a LDO would need a large heat sink for when I lower the output voltage. I am on the same boat as you, I don't have any experience with DC-DC converters (have worked with modules). And I can see my self frying a few parts trying to get it right.

    I would use a LDO for the prop, and the other electronics. Just the coil would be on the DC-DC.
  • TCTC Posts: 1,019
    edited 2014-07-10 05:53
    kwinn wrote: »
    Quitting smoking is a great idea. Wish you the best of luck with it.

    Thank you so much

    1) Can't find any trustworthy data on the sony battery but even if the 30 amp discharge rate is true it would only be able to sustain that for about 5 minutes before the battery was totally discharged.

    That is why I don't believe it. If it is true, I want to take 20 of those batteries, (series parallel) and jump start a car. I would assume it would be lighter than a lead acid jump pack.

    2) The resistance goes up slightly as the nichrome heats up, but only increases by about 6% or 10% (depending on alloy) at 2000 degrees F. See en.wikipedia.org/wiki/Nichrome.

    Thats not that bad.

    3) Noise is not a problem for a Nichrome heating element. It gets converted to heat, so a simple DC-DC is fine. Even a DC-AC converter would be fine, although it would be simpler to use a voltage that would produce the maximum desired temperature and PWM it for the lower temperatures.

    Now thats a good idea. And that should be less parts too.
  • PublisonPublison Posts: 12,366
    edited 2014-07-10 06:41
    Interesting that the pictures in the link to the Sony batteries do not show a Sony logo on them. Just a generic slap on label. May be an OEM version.
  • LoopyBytelooseLoopyByteloose Posts: 12,537
    edited 2014-07-10 07:06
    In general, Lithium ion batteries are known not to tolerate a short circuit. So I have to wonder where the power draw is equivalent to a short circuit load. The physical construction of the anodes and cathodes apparently include some very thin coatings of exotic materials (such a rare earth compounds) and since the coatings are thin.. they are fragile under excess loads and pulling the batteries voltage down below a certain discharge limit.


    As to the question of whether a heating coil is an inductive coil in the normal sense. I doubt it. But you would really have to measure how many Henrys or micro-Henrys on can generate.... after al it is a coil and doe have some inductive properties.

    As far as quiting smoking... I have quit long term twice. The second time was over 30 years ago, the first time was for 13 years at an earlier age. I found that the only way I could do so is to accept that I was miserable with tobacco, so I could accept being miserable but heathier without it. Detox is only about one week from the physical craving, but it takes about a year before you get a feeling of well-being from no nicotine. I doubt if using a subsitute nicotine delivery system of any sort is going to achieve any real benefit - health-wise, money-wise, or emotion-wise.

    I'd just accept that for a week I would be uncomfortable, distracted, and irritable. Remembering the withdrawal experience is part of what puts an end to smoking.
  • davejamesdavejames Posts: 4,047
    edited 2014-07-10 07:12
    TC wrote: »
    Could a heating coil have inductive kick? (out-rush)

    The "inductive kick" is a function of the coil's inductance value (typically noted in spec sheets as H for Henrys).

    Not knowing the particular characteristics of nichrome wire, I'd have to SWAG that seven turns is not going to be a bother.

    If it's a great concern to you, and if you have a scope handy, take a look at the coil when switching the unit off.



    ***well, Loopy beat me to it.
  • RDL2004RDL2004 Posts: 2,554
    edited 2014-07-10 07:15
    I quit smoking over 15 years ago after over 20 years of a 3 pack a day habit. It was actually pretty easy. I got it as a free bonus with a bad case of pneumonia. After days of barely being able to breathe and having to literally crawl to the bathroom, I finally felt good enough to walk out on the balcony and light up my first cigarette since getting sick. The first drag put me on the floor in a fit of coughing that nearly caused me to pass out. I threw that cigarette over the rail and have not lit another one since.
  • jazzedjazzed Posts: 11,803
    edited 2014-07-10 07:28
    How is "vape" not smoking?
  • LoopyBytelooseLoopyByteloose Posts: 12,537
    edited 2014-07-10 07:59
    In actual smoking you get the carbon monoxide which the blood actually prefers over oxygen. That in turn damages the lungs and causes heart disease.

    Nicotine is a toxin and a nasty one. Chewing tobacco doesn't have any smoke, but you do get oral cancer. I turned 66 this year and my dad who smoked only Carltons (for the low tar and nicotine) couldn't walk at 66 due to emphasema. He thought the Carltons would avoid lung cancer, but he died of stomach cancer (which is the 2nd highest cancer amongst smokers). I suppose that 'vape' won't prevent either kind of cancer.
  • kwinnkwinn Posts: 8,697
    edited 2014-07-10 08:09
    In actual smoking you get the carbon monoxide which the blood actually prefers over oxygen. That in turn damages the lungs and causes heart disease.

    Nicotine is a toxin and a nasty one. Chewing tobacco doesn't have any smoke, but you do get oral cancer. I turned 66 this year and my dad who smoked only Carltons (for the low tar and nicotine) couldn't walk at 66 due to emphasema. He thought the Carltons would avoid lung cancer, but it died of stomach cancer (which is the 2nd highest cancer amongst smokers). I suppose that 'vape' won't prevent either kind of cancer.

    Tobacco use of any kind is a nasty disgusting habit. I am sad to say that I was a smoker in my young and foolish days, but quit in my early twenties. One of the best things I have ever done.
  • TCTC Posts: 1,019
    edited 2014-07-10 08:27
    Publison wrote: »
    Interesting that the pictures in the link to the Sony batteries do not show a Sony logo on them. Just a generic slap on label. May be an OEM version.

    That is another thing that makes me question it.

    In general, Lithium ion batteries are known not to tolerate a short circuit. So I have to wonder where the power draw is equivalent to a short circuit load. The physical construction of the anodes and cathodes apparently include some very thin coatings of exotic materials (such a rare earth compounds) and since the coatings are thin.. they are fragile under excess loads and pulling the batteries voltage down below a certain discharge limit.


    As to the question of whether a heating coil is an inductive coil in the normal sense. I doubt it. But you would really have to measure how many Henrys or micro-Henrys on can generate.... after al it is a coil and doe have some inductive properties.

    As far as quiting smoking... I have quit long term twice. The second time was over 30 years ago, the first time was for 13 years at an earlier age. I found that the only way I could do so is to accept that I was miserable with tobacco, so I could accept being miserable but heathier without it. Detox is only about one week from the physical craving, but it takes about a year before you get a feeling of well-being from no nicotine. I doubt if using a subsitute nicotine delivery system of any sort is going to achieve any real benefit - health-wise, money-wise, or emotion-wise.

    I'd just accept that for a week I would be uncomfortable, distracted, and irritable. Remembering the withdrawal experience is part of what puts an end to smoking.

    This will be my 3rd time quitting. I am tired of smoking.

    I wonder if a 123mOhm load is considered a short.?.?

    davejames wrote: »
    The "inductive kick" is a function of the coil's inductance value (typically noted in spec sheets as H for Henrys).

    Not knowing the particular characteristics of nichrome wire, I'd have to SWAG that seven turns is not going to be a bother.

    If it's a great concern to you, and if you have a scope handy, take a look at the coil when switching the unit off.



    ***well, Loopy beat me to it.

    I am not worrying about it. More just my own curiosity.

    RDL2004 wrote: »
    I quit smoking over 15 years ago after over 20 years of a 3 pack a day habit. It was actually pretty easy. I got it as a free bonus with a bad case of pneumonia. After days of barely being able to breathe and having to literally crawl to the bathroom, I finally felt good enough to walk out on the balcony and light up my first cigarette since getting sick. The first drag put me on the floor in a fit of coughing that nearly caused me to pass out. I threw that cigarette over the rail and have not lit another one since.

    First time I quit, was from getting chicken pox at the age of 19. For 3 weeks, I did not even think of a smoke.
    jazzed wrote: »
    How is "vape" not smoking?

    It is safer then smoking. It is mostly just vapor. Like a fog machine.

    I am doing it this way so I can slowly cut down on my nicotine intake. And to take care of the hand-to-mouth.
  • TCTC Posts: 1,019
    edited 2014-07-10 08:33
    In actual smoking you get the carbon monoxide which the blood actually prefers over oxygen. That in turn damages the lungs and causes heart disease.

    Nicotine is a toxin and a nasty one. Chewing tobacco doesn't have any smoke, but you do get oral cancer. I turned 66 this year and my dad who smoked only Carltons (for the low tar and nicotine) couldn't walk at 66 due to emphasema. He thought the Carltons would avoid lung cancer, but it died of stomach cancer (which is the 2nd highest cancer amongst smokers). I suppose that 'vape' won't prevent either kind of cancer.

    That is one reason I want to quit. Plus because I am tired of coughing all the time. Since there is not much research in to "vape" (or any E-cigarette), no one really knows the long term side effects. But hay, you never know, I might be able to grow another hand. And that would be useful for all the times I needed another hand. :lol:
  • TCTC Posts: 1,019
    edited 2014-07-10 08:34
    kwinn wrote: »
    Tobacco use of any kind is a nasty disgusting habit. I am sad to say that I was a smoker in my young and foolish days, but quit in my early twenties. One of the best things I have ever done.

    This is my last time. I am so tired of it.
  • LoopyBytelooseLoopyByteloose Posts: 12,537
    edited 2014-07-10 10:20
    Good luck on quitting tobacco. If you are ready, we will all cheer you on through your week of hell.

    Expect to gain a bit of weight due to substitute cravings -- like Hagendas or pizza and so on.
  • jazzedjazzed Posts: 11,803
    edited 2014-07-10 11:51
    TC wrote: »
    It is safer then smoking. It is mostly just vapor. Like a fog machine.

    I am doing it this way so I can slowly cut down on my nicotine intake. And to take care of the hand-to-mouth.


    When we have 100 years of Vape smoking, then I may believe it is safe. Safer? Maybe, but it's still disgusting to me.

    I smoked for 20 years and quit for good Jan 7th 2000 (I have been fortunate so far, but I still spit up tar).

    I tried many gimmicks before that day to quit, but in the end my desire to smoke was what stopped me from quitting. Using Vape to quit is just another gimmick like bumming (from whatever friends you have left), chewing tobacco, dipping snuff, using nicotine gum, using the patch, etc.... The point is that if you do not want to quit, you never will quit.

    How did I do it? One day I realized that smoking was taking away my mental capacity because my ability to absorb oxygen was diminished in my audibly clicking and wheezy lungs. Well, I just couldn't stand becoming sicker and stupid.

    Armed with that information and new found desire to quit, I decided I would quit by any means necessary. I knew that nicotine was the main physical reason for my addiction. So I decided to use the patch which I had tried briefly without the will to quit. Nicotine gum was disgusting to me. I hesitated at first because I thought that would hook me into a street-drug-cost-like habit (well, it didn't). By any means, meant that I bought the patch kit and literally over-dosed myself to avoid smoking for a solid week. Then my terrible rescue happened.

    After the first week of using the patch, I started having vivid nightmares. My dreams about Marlborough cartons were shockingly real ... wonder why. Then one night about a week later I dreamed vividly, and in the most horrifically fine detail that my precious little girl was beaten to death by a man; her guts were spilled all over the road in high-definition. I woke up sweating and crying. I swear the devil had me or something. Then I fell asleep and had the worst possible dream of a baby and a microwave. OMG.

    Well, my fear of having to keep a crack-like nicotine habit totally went away with the next morning as I cried and cried. I kept one last patch for an emergency, and stopped using them entirely. I've had the desire again, but there is no way that I will ever smoke again. The Vape place I see on my thrice-weekly 2.2 mile run reminds me of all this, and sometimes I imagine it like something in my microwave nightmare. Fortunately I didn't need a horror story to convince me to take control of my obesity ... like some Hugh Laurie House epiphany.

    I'm sorry if this story was too much, but sometimes people need a real wakeup. That's what it took for me.

    Good luck to you.
    --Steve
  • jazzedjazzed Posts: 11,803
    edited 2014-07-10 11:58
    Good luck on quitting tobacco. If you are ready, we will all cheer you on through your week of hell.

    Expect to gain a bit of weight due to substitute cravings -- like Hagendas or pizza and so on.


    Indeed and agreed on all points. Make up your mind and quit while you still can.

    Start exercising (low impact is recommended).
  • W9GFOW9GFO Posts: 4,010
    edited 2014-07-10 12:12
    I quit smoking decades ago simply because it began to taste bad to me. I stopped wanting it - maybe I never was actually addicted. That was when I was driving truck and there was not much else to do. My mother finally quit a year ago after having triple bypass surgery. Once in a great while if someone offers a smoke I will take it but I have no inclination to start up the habit again, it's too expensive anyway.
  • PublisonPublison Posts: 12,366
    edited 2014-07-10 13:24
    My ex-wife went to an acupuncture therapist 10 years ago, and the day she walked out, never had another cig.

    I've heard hypnotism had the same effects.
  • Heater.Heater. Posts: 21,230
    edited 2014-07-10 13:43
    Publison,
    My ex-wife went to an acupuncture therapist 10 years ago, and the day she walked out, never had another cig.
    That is a joke right? Or did you get the grammar horribly wrong?
  • TCTC Posts: 1,019
    edited 2014-07-10 14:38
    jazzed wrote: »
    When we have 100 years of Vape smoking, then I may believe it is safe. Safer? Maybe, but it's still disgusting to me.

    I smoked for 20 years and quit for good Jan 7th 2000 (I have been fortunate so far, but I still spit up tar).

    I tried many gimmicks before that day to quit, but in the end my desire to smoke was what stopped me from quitting. Using Vape to quit is just another gimmick like bumming (from whatever friends you have left), chewing tobacco, dipping snuff, using nicotine gum, using the patch, etc.... The point is that if you do not want to quit, you never will quit.

    How did I do it? One day I realized that smoking was taking away my mental capacity because my ability to absorb oxygen was diminished in my audibly clicking and wheezy lungs. Well, I just couldn't stand becoming sicker and stupid.

    Armed with that information and new found desire to quit, I decided I would quit by any means necessary. I knew that nicotine was the main physical reason for my addiction. So I decided to use the patch which I had tried briefly without the will to quit. Nicotine gum was disgusting to me. I hesitated at first because I thought that would hook me into a street-drug-cost-like habit (well, it didn't). By any means, meant that I bought the patch kit and literally over-dosed myself to avoid smoking for a solid week. Then my terrible rescue happened.

    After the first week of using the patch, I started having vivid nightmares. My dreams about Marlborough cartons were shockingly real ... wonder why. Then one night about a week later I dreamed vividly, and in the most horrifically fine detail that my precious little girl was beaten to death by a man; her guts were spilled all over the road in high-definition. I woke up sweating and crying. I swear the devil had me or something. Then I fell asleep and had the worst possible dream of a baby and a microwave. OMG.

    Well, my fear of having to keep a crack-like nicotine habit totally went away with the next morning as I cried and cried. I kept one last patch for an emergency, and stopped using them entirely. I've had the desire again, but there is no way that I will ever smoke again. The Vape place I see on my thrice-weekly 2.2 mile run reminds me of all this, and sometimes I imagine it like something in my microwave nightmare. Fortunately I didn't need a horror story to convince me to take control of my obesity ... like some Hugh Laurie House epiphany.

    I'm sorry if this story was too much, but sometimes people need a real wakeup. That's what it took for me.

    Good luck to you.
    --Steve

    A story can never be to much, when it is true, and someone has been through it. Stories like that are great to see the bad sides of things. Thank you for it. Makes me want to quit even more.

    jazzed wrote: »
    Indeed and agreed on all points. Make up your mind and quit while you still can.

    Start exercising (low impact is recommended).

    Low impact is the only way I can go. I have to much pain in my body to high impact.

    W9GFO wrote: »
    I quit smoking decades ago simply because it began to taste bad to me. I stopped wanting it - maybe I never was actually addicted. That was when I was driving truck and there was not much else to do. My mother finally quit a year ago after having triple bypass surgery. Once in a great while if someone offers a smoke I will take it but I have no inclination to start up the habit again, it's too expensive anyway.

    I am addicted, but not to smoking, to nicotine. I got my vape on Monday June 30th, I opened a pack of smokes on my way to pick up my unit. I still have a little less then a half a pack left, of that pack I opened on the 30th. I tried to smoke a cigarette just for the heck of it, and to see what would happen. I got one puff out, and that was it. I could not stand the taste. I tossed the smoke out the window.

    I know this vape thing might not be the best thing out there, but it is helping. I cant do patches (makes my arms numb), and the gum tastes worse than a cigarette to me. So to find this, that allows me to adjust everything to what works best, is exactly what I needed.

    Thank you everyone for the encouragement. And please feel free to call me out anytime on how I am doing.
  • TCTC Posts: 1,019
    edited 2014-07-10 14:45
    Publison wrote: »
    My ex-wife went to an acupuncture therapist 10 years ago, and the day she walked out, never had another cig.

    I've heard hypnotism had the same effects.
    Heater. wrote: »
    Publison,

    That is a joke right? Or did you get the grammar horribly wrong?


    I have to agree Heater... Are you reading it the way I am? She went to a acupuncture therapist. Then at a later date, she walked out (walked out on Publison). And from the time she walked out (no more stress maybe??), she has not had a cigarette.

    I hope he is kidding. I don't want to be right on this.
  • GenetixGenetix Posts: 1,754
    edited 2014-07-10 14:55
    A friend of mine's dad quit cold turkey, another friend stopped smoking after getting really sick but started again a while later, and another friend smoked less after taking medication but stopped taking the medication because he couldn't stand not having a cig in his hand.

    Medicine is good if you are chemically addicted but not if you are physically addicted. The best thing is to smoke less and less as time goes on since not everyone can stop suddenly unless you are just too sick to smoke at all. If vape-ing helps you to smoke less and less then so be it but the truth is it's just another way to get that "fix".

    As for your Propeller idea, do you want constant or on-demand heating? PWM requires less power than On-Off control especially if the heater will always be active.
  • PropGuy2PropGuy2 Posts: 360
    edited 2014-07-10 15:03
    Thanks for sharing, Jazzed. I think we all have demons inside of us. It's part of being human - we are not perfect by any means. At the same time we can control our destiny if we choose to.
  • PublisonPublison Posts: 12,366
    edited 2014-07-10 15:21
    Heater. wrote: »
    Publison,

    That is a joke right? Or did you get the grammar horribly wrong?

    OK. To make it clear. She went to an acupuncture therapist to get off cigarettes. After therapy, (just that one day), she didn't have another cigarette.

    She walked out on me long before that. :)
  • PJAllenPJAllen Banned Posts: 5,065
    edited 2014-07-10 18:21
    About
    I have not made a coil as of yet, but people I have talked to suggest a 28AWG wire, wrapped around a 3/16' (or so) drill bit, about 7 times. That should make about a 1ohm coil. Again, this is only what I have heard, I have not confirmed it.

    If you wrapped enameled or insulated wire around a bit, or a nail, as when winding a simple electro-magnet, that stands to reason (the principle, if not the stated "1ohm" result.)
    But you're trying to fabricate a heating element.

    I assume that enamel vapors or melting insulation wouldn't accentuate the vape experience.

    But if it's uninsulated wire then the windings will short out, and even if there is space between windings then the wire will short to the bit (assuming it's not a ceramic or plastic bit.)
  • LoopyBytelooseLoopyByteloose Posts: 12,537
    edited 2014-07-10 21:57
    That nail is significant... iron-core coils behave very differently from air-core coils. I believe the induction values are greater. I hadn't mentioned this before as it seemed a bit of a distraction.

    Recently I have been pondering making some sort of mag-lev toy. It seems that whatever I do, I will have to wind my own coils.
  • LoopyBytelooseLoopyByteloose Posts: 12,537
    edited 2014-07-10 23:33
    BTW, about that 30amp load on a Lithium ion cell...

    It seems that anything over 2C (C being the rated AmpHour capacity) is highly unstable. So you would have to have a 15AH rated Lithium ion cell to get a stable 30amp load working right.... most are 2.5AH or less in the 18650 package.

    http://www.candlepowerforums.com/vb/showthread.php?84980-2400mAh-LG-18650-cell-discharge-graph
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