Battery question...

Discussion in 'New Members Forum' started by EsOne, Oct 23, 2013.

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  1. EsOne

    EsOne Senior Member Verified Member ECF Veteran

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    Millbury OH
    I have an EH 18650 IMR

    Says 3.7v on it...

    This is going to sound dumb, but I just really recently got my first mod (then second, then third... oh my)
    But, I still charge it to 4.2v, max, right?
     
  2. State O' Flux

    State O' Flux Vaping Master Verified Member ECF Veteran

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    [​IMG]
     
  3. bruiser

    bruiser Ultra Member ECF Veteran

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    Yep, charge it until it stops charging.
     
  4. EsOne

    EsOne Senior Member Verified Member ECF Veteran

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    I got a cheap charger. I don't trust it to stop. I manually check mine with multimeter ^_^
     
  5. Topwater Elvis

    Topwater Elvis Ultra Member ECF Veteran

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    Then you are already smarter than a bunch of folks that rely on any charger to function correctly 100% of the time.
     
  6. AttyPops

    AttyPops Yeah, I type stuff. ECF Veteran

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    Yeah, 3.7 is the "nominal/average" charge, but 4.2 is the "fully charged" point...it changes continually as the battery is drained.

    Most of the useful life of the battery's charge is in the 3.7/3.6 range. This varies a bit by battery type but is the general rule. The top range doesn't last long at all, and the bottom drops to cut off rather quickly. This is why they say that the voltage curve of Li-Ion is rather flat compared to other types.
     
  7. madqatter

    madqatter Ultra Member ECF Veteran

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    Trash that charger and invest in a better one. Continue to manually check them with a multimeter. :thumb:
     
  8. Ryedan

    Ryedan ECF Guru Verified Member ECF Veteran

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    You've got some great advice here EsOne. You probably know this, but good chargers are pretty cheap. Get one and you won't have to worry about it overcharging. Makes charging much more relaxing :thumb:
     
  9. EsOne

    EsOne Senior Member Verified Member ECF Veteran

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    On a related note.. What's the lowest I should let it drop before charging? I've heard around 3.3v, but I also hear around 3.5

    Sent from my SPH-L710 using Tapatalk
     
  10. Ryedan

    Ryedan ECF Guru Verified Member ECF Veteran

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    I aim to change batts at 3.6 volts on mechanical mods. Let it go lower and you might not catch it till it goes way low.

    As I understand it, under 2.5 volts and it's toast. Between 3.2 and 2.7 volts and you will reduce the battery lifespan.
     
  11. EsOne

    EsOne Senior Member Verified Member ECF Veteran

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    Alright, 3.6 on my mechs and 3.3 area on my Lavatube. Got it! Thanks so much! Kind if just jumped into mods without learning first. Lol. Had to talk myself out of my 4th one today.

    Damn new hobbies.

    Sent from my SPH-L710 using Tapatalk
     
  12. grayscale

    grayscale Super Member Verified Member ECF Veteran

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    lol! +1 on that! Can anyone suggest a "quality" charger that is known to be reliable?
     
  13. abstractcousin

    abstractcousin Senior Member ECF Veteran

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    yea you be fine, just be sure not to keep it in the charger too long
     
  14. darkgear

    darkgear Super Member Verified Member ECF Veteran

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    As a general rule,

    4.2V – 100%
    4.1V – 87%
    4.0V – 75%
    3.9V – 55%
    3.8V – 30%
    3.5V – 0%

    Under load the over discharge circuit may stop drain at 2.75v or 2.5v then they will rebound to 3.5 without a load.

    Each brand of cell is different. For example the Panasonic NCR18650 / NCR18650A has about 15-20% capacity left even at 3.5v. In fact, Panasonic ships these cells from the factory at ~3.6 - 3.65v. Other cells, would have around 5-10% or so left at 3.5v. I'd say generally ~3.3v would be considered 0% for most cells.
     
  15. madqatter

    madqatter Ultra Member ECF Veteran

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  16. darkgear

    darkgear Super Member Verified Member ECF Veteran

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: lavatube
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