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Nitecore SC4-Internal Resistance Measurement

Discussion in 'Batteries and Chargers' started by skineedog, Nov 29, 2017.

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  1. skineedog

    skineedog Senior Member ECF Veteran

    Oct 29, 2015
    I just unboxed a new Nitecore SC4 battery charger. Was very excited to have the ability to charge at 6amps across four slots AND to be able to measure the battery's internal resistance.

    So, after measuring the internal resistance of twenty 18650s and six 26650s, I realized the resistance measured by the charger would almost always be different if I remeasured the battery.

    When measuring the battery, I only insert it long enough to take a reading not to begin charging and therefore heating the battery which could affect the resistance.

    Does anyone else have this charger? If so, what are your results when measuring the IR?
     
  2. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    I don't have that charger but your measurements should be in the 18mOhm to 25mOhm range for the 15A to 30A batteries we use, when fairly new. These numbers are for fully charged batteries allowed to rest at least 1/2 hour after before no charged. The internal resistance change significantly with temperature and, less so, with the state of charge of the battery.

    Removing and reinserting the battery shouldn't change the measurement by more than a milliohm, at the most.
     
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  3. KGB7

    KGB7 Ultra Member Verified Member ECF Veteran

    Nov 23, 2014
    Rockville, MD
    Just to be clear, 6amps across all slots, is only 1.5amp per slot when you charge 4 batteries at the same time.

    I just hope you don’t think you can charge at 6 amps per slot.
     
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  4. AlB53

    AlB53 Super Member Verified Member ECF Veteran

    Supporting member
    Feb 7, 2012
    Rome NY
    so if it's lower than 18mOhm or over 25mOhm we shouldn't use them?
    I have a XTAR dragon Plus that checks IR, checking some after work.
     
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  5. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    No, that's just a typical range.
    Lower than that is never a problem. Higher than that just indicates an incorrect reading or a battery that is aging or has been damaged. Stop using them whenever their performance drop pisses you off too much. The IR won't really matter. :)
     
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  6. AlB53

    AlB53 Super Member Verified Member ECF Veteran

    Supporting member
    Feb 7, 2012
    Rome NY
    Thanks Mooch, most of my HG2's are 1 1/2 years old. I have 2 sets of 2 that I use in my work mods, there all good but 1 battery takes longer to charge, I'll test that 1 first.
     
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  7. DaveP

    DaveP PV Master & Musician ECF Veteran

    May 22, 2010
    Central GA
    I'm thinking of ordering this charger/analyzer for its ability to cycle a battery and report its current MAH rating to determine which of my batteries are candidates for recycle and replacement. I have quite a few Sony VCT6's, Samsung 30Q's, and LG HG2's, some of which are suspect for declining battery life. This one can do a standard recharge or cycle the battery down to a preset voltage point and recharge, and then report MAH state at end of the deep cycle charge.

    Anyone used this one or have a suggestion for a better analyzer under $50?

    https://www.amazon.com/AccuPower-IQ338-Analyzer-Rechargeable-Batteries/dp/B013HP4N70/ref=sr_1_1?ie=UTF8&qid=1512660002&sr=8-1&keywords=18650+charger+analyzer

    [​IMG]
     
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  8. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    No recommendations but no need to measure capacity. Just replace when their decreased performance pisses you off too much. :)
     
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  9. stols001

    stols001 Moved On ECF Veteran

    Supporting member
    May 30, 2017
    Hmm... that is an interesting looking charger. I did say I was going to get another... :)

    Anna
     
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  10. skineedog

    skineedog Senior Member ECF Veteran

    Oct 29, 2015
    Well, I'm going to go for incorrect reading. Two sets checked were new, never used VTC5As. The lowest reading I got with any batteries I tested was 42.

    No, I was never under the impression I would be able to charge 6 amps per slot. It's 6amps across all four slots... But it can charge 2 slots at 3amps each. Or 4 slots at 1.5 each. Total never more than 6amps....
     
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  11. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    If the readings are pretty consistent across multiple readings of the same cell, within a mOhm or so, then you can use that feature without problems. A consistent offset from the actual IR is ok.
     
    • Like Like x 1
  12. DaveP

    DaveP PV Master & Musician ECF Veteran

    May 22, 2010
    Central GA
    42 ... the meaning of life, according to the Hitchhiker's Guide to the Galaxy. :)
     
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