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Bench Test Results: Prodna Purple 40A 2500mAh 18650…ridiculously overrated, not IMR

Discussion in 'Batteries and Chargers' started by Mooch, Jan 2, 2018.

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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” batteries 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 continuous 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.

    296CC1B2-325A-476B-8CDD-2CCF28019F51.jpeg B3DE021D-61F3-4087-A032-DCC567AC9BD8.jpeg 6183DD09-3041-4C52-BCDB-EB399114D95C.jpeg C3142A18-FB6D-4A01-8844-9CA290724129.jpeg

    Bottom Line
    This cell has a hugely exaggerated 40A rating on the wrap. It can’t even be considered a pulse rating.

    Any “max” or “pulse” rating is useless unless we know the length of the pulse, the time between the pulses, and the criteria used to set the rating (Voltage sag? Temperature? Run time? A combination of those?). Without knowing this, and all companies using the same pulse lengths, rest times, and criteria, we can’t use the max/pulse ratings for comparing any batteries. They are useless.

    This battery says “IMR 18650” on the wrap but it does not use the battery chemistry associated with the IMR manufacturer’s model number prefix. It uses the “hybrid” chemistry sometimes identified with the INR prefix.

    The Prodna web site pages for their batteries use some sort of coiling kit contents list for the battery details and the reviews on the web site are still test reviews in the fake Latin used for placeholder text. This is confusing at best.

    I placed an order on their web site for eight cells but they were never shipped and Prodna ignored several attempts over a period of weeks to contact them via two email addresses. I only received my money back after filing a claim with PayPal. All of the cells I eventually tested were donated.

    This cell’s appearance is essentially identical to the LG HE2 and HE4. Its performance is identical to the HE4 and very close to the HE2. I estimate this Prodna’s ratings to be 20A and 2500mAh.

    The cells were donated for the purposes of testing. Thank you!

    Continuous Current Discharge Comparison to LG HE2/HE4

    Prodna’s Web Site
    E1856A6B-5E73-4B51-8EAB-F7EB851D367E.png FD0573AB-72A4-44F5-A3C9-DEC386500287.jpeg E54A3B26-671F-4AE7-B091-F95F582A698A.jpeg

    Ratings Graphic

    To see how other cells have tested check out this link:
    • Like Like x 4
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  2. sonicbomb

    sonicbomb Vaping Master Verified Member ECF Veteran

    Feb 17, 2015
    1187 Hundertwasser
    • Like Like x 2
  3. stols001

    stols001 Mistress of the Dark Nicotinic Arts Verified Member ECF Veteran

    Supporting member
    May 30, 2017
    Thanks again Mooch :)

    • Like Like x 1
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