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Bench Test Results: Golisi S30 Black 35A 3000mAh 18650…overrated but they’re rewrapping

Discussion in 'Batteries and Chargers' started by Mooch, Dec 31, 2017.

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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, LG, Panasonic, 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.

    IMG_1792.JPG IMG_1793.JPG IMG_1794.JPG IMG_1795.JPG

    Bottom Line
    This cell claims a 35A continuous current rating and 3000mAh capacity. These are both exaggerated but Golisi has agreed to rewrap these cells with a 25A rating before March 2018.

    While I was quite disappointed to see the exaggerated ratings I am glad they say they will be rewrapping these cells with more realistic ratings. At its claimed 35A continuous rating it delivered less than 100mAh down to 3.2V. At a 0.5A discharge it only delivered 2846mAh.

    This appears to be a China-manufactured cell as it doesn’t match any Samsung, Sony, LG, or Panasonic/Sanyo that I have. Golisi’s discharge graph shows a cell with much better performance than the four I tested. I had a couple of discussions with Golisi about the differences between the factory’s test results and mine but we weren’t able to resolve anything. I am unable to explain the discrepancy.

    The four cells I tested showed the typical variance in capacity and internal resistance for China-manufactured cells. I don’t think these cell-to-cell differences are noticeable when vaping though.

    Golisi has compared this cell’s performance to the 20A 2500mAh LG HE2 in a Facebook post. Its voltage while running and capacity are a bit worse than the HE2 down to 3.2V but the Golisi does run a few degrees-C cooler.

    I estimate this Golisi’s ratings to be 22A and 2800mAh.

    Four cells were donated for the purposes of testing by Golisi ( Thank you!

    Continuous Current Discharge Graphs
    Golisi S30 35A 3000mAh 18650 Capacity Tests.jpg Golisi S30 35A 3000mAh 18650 CC Tests.jpg Golisi S30 35A 3000mAh 18650 20A CC Tests.jpg Golisi S30 35A 3000mAh 18650 CC Tests vs HE2 and HG2.jpg

    Golisi’s Continuous Current Discharge Graph

    Ratings Graphic

    Performance Specs
    • DC Internal Resistance = 22.2mOhms (milliohms) average for the four cells.
    • Total energy delivered down to 3.2V at 10A continuous = 6.44Wh (Watt-hours) average
    • Total energy delivered down to 3.2V at 20A continuous = 3.64Wh (Watt-hours) average

    • Golisi paid a fee to be moved to the front of the testing queue, which currently has a 10-12 week backlog. This cannot influence my test results as they pay in advance, have no say about what is in this report, and I don’t care if any company never does this or donates batteries again. My reputation is a lot more important than any battery donation or payment.
    • To see how other cells have tested check out this link:
    • Like Like x 2
    • Useful Useful x 1
  2. sonicbomb

    sonicbomb Vaping Master Verified Member ECF Veteran

    Feb 17, 2015
    1187 Hundertwasser
    Kudos to you for encouraging them be honest about their product.
    • Agree Agree x 1
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