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Bench Test Results: QSO 25A 2600mAh 18650...overrated, QSO says it’s LiPo, DO NOT BUY

Discussion in 'Batteries and Chargers' started by Mooch, Jul 17, 2019.

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  1. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    These tests below only note the ESTIMATED ratings for these batteries at the time I tested them. Any battery that is not a genuine Samsung, Sony, Murata, LG, Panasonic, Molicel, or Sanyo can change at any time! This is one of the hazards of using “rewrapped” or batteries from other manufacturers so carefully research any battery you are considering using before purchasing.

    Misusing or mishandling lithium-ion batteries can pose a SERIOUS RISK of personal injury or property damage. They are not meant to be used outside of a protected battery pack. Never exceed the battery’s current rating and keep the plastic wrap and top insulating ring in perfect condition.

    Testing batteries at their limits is dangerous and should never, ever, be attempted by anyone who has not thoroughly studied the dangers involved, understands the risks, has the proper equipment, and takes all appropriate safety precautions.

    If the battery has only one current rating number, or if it only says "max", then I have to assume the battery is rated at that current level for any type of discharge, including continuous.

    E7EFF397-4B4E-4762-B0A8-BB19852D4755.jpeg 509CBDBA-628E-4BB0-9802-24FCEA189450.jpeg F109A508-9D0D-4FF9-B292-5B77289A4680.jpeg FC611AA5-66A7-4B59-9142-6DCE3772F60B.jpeg

    Bottom Line
    This overrated QSO appears identical to, and performs identically to, the Samsung 25R which a 20A-rated 2500mAh cell.

    But one of the documents I requested from QSO, the Material Safety Data Sheet (MSDS), says that this cell uses the same “chemistry” as LiPo’s. That does not mean they are dangerous! If they do use this chemistry though it would mean that if they are misused or mishandled they can go into thermal runaway, and possibly burst, at a lower temperature and that their reactions during runaway are more violent than the other Li-Ion chemistries we can use.

    I was very surprised to see QSO list the same chemistry as used by LiPo’s in their MSDS since that chemistry, lithium-cobalt oxide (LCO), is rarely used anymore in round cells. I am told by those who know a lot more about the battery industry than I do that the price of cobalt is just too high to justify its use for low cost round cells like the ones we use. Well, they’re low cost when manufactured. The markups in price before they get to us are huge.

    The wraps for these cells say “LI-MN” which I am pretty sure QSO wants us to think is lithium-manganese. This is consistent with the chemistry for some non-LiPo cells we use but is in direct conflict with QSO’s claim that these are LiPo’s in their MSDS. There is no manganese in a LiPo cell.

    So what’s the big deal about having an accurate MSDS? They exist to inform employees and first-responders of the risks involved if they need to handle a spill or fire involving a product. If the MSDS is wrong that would make responding properly harder to do.

    An incorrect MSDS would also mean that any vendor importing those cells into their country, like in the EU, would be submitting documents with the wrong info to the authorities. This means the wrong substances are being registered and could affect whether that vendor can sell those cells if the MSDS issues are discovered. I suspect that would be less than good news to the vendors.

    If you believe the MSDS is accurate then QSO is using the same chemistry as LiPo’s for these cells. With all of the other cells we can buy though why would we buy ones that use the same chemistry as LiPo‘s (with its increased volatility)? If the MSDS is not accurate, and these cells are rewraps, then QSO needs to explain why this safety document says they are LiPo’s. Either way, this earns this QSO cell a Do Not Buy recommendation from me.

    Two cells were purchased for the purposes of testing by me.

    Continuous Current Discharge Graphs
    97CDDD91-AEF0-4B70-9AFD-EEDD48D1D5B9.jpeg B4D8EED3-BC79-4826-9A9B-902C12C577A5.jpeg

    Ratings Graphic

    Material Safety Data Sheet (MSDS)

    Performance Specs
    Not tested.

    I want to work for the vaping community full time! If you feel what I do is worth a couple dollars a month and you would like early access to battery availability and testing news and a say in what I test then please consider becoming a patron and supporting my testing efforts: Battery Mooch is creating battery tests and educating vapers | Patreon.

    To see how other cells have tested check out this link: List of Battery Tests | E-Cigarette Forum
    • Informative Informative x 4
    • Like Like x 1
  2. Baditude

    Baditude ECF Guru ECF Veteran

    Apr 8, 2012
    Ridgeway, Ohio
    Sounds like another shady re-wrap company to me. I'd avoid these batteries like the plague.
    • Agree Agree x 2
  3. Robin Becker

    Robin Becker Senior Member ECF Veteran

    Feb 3, 2018
    Agree and in addition completly incompetenet, unqualified...just name it. Taking a Li-Ion battery and "creating" with copy and paste a SDS of a Lipo....:shock: how stupid one can be?!
  4. sonicbomb

    sonicbomb Vaping Master Verified Member ECF Veteran

    Feb 17, 2015
    1187 Hundertwasser
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