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Bench Test Results: Efest 10.5A 700mAh 18350...an average performing 7A battery, same as Nitecore

Discussion in 'Batteries and Chargers' started by Mooch, Jun 20, 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” 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.

    EB9DA787-4C2A-49DB-BE63-15BBD3D15F43.jpeg F793FA54-9B04-42C5-AA74-688A27E24C65.jpeg D92BEAA8-5629-452B-A9D7-12F09B143800.jpeg 21BE569D-CC6B-468E-BCE7-C69E6E0CE979.jpeg


    Bottom Line
    While this cell has an accurate 7A continuous current rating on the wrap it is in very tiny print and a useless 10.5A “pulse” rating is above it in much larger type. This is confusing, unnecessary, and I would like to see this type of overrating stopped.

    It is an average performer, a bit better than the overrated AWT 10.5A 850mAh cell. It appears to be the same cell as the Nitecore 7A 700mAh 18350.

    The two cells I tested delivered 713mAh and 708mAh at 0.2A down to 2.5V.

    I am estimating this Efest’s ratings at 7A and 700mAh. Current ratings for high internal resistance cells like these are a combination of the temperature the cell runs at and how badly the voltage sags, i.e., its Wh specs.

    The performance of any 18350 really suffers at higher current levels due to their very high internal resistance, leading to huge voltage sag. I recommend staying under their continuous current rating. This results in much more efficient operation and much longer vaping time.

    This is the sixth in a group of seven 18350’s I am testing and I will be posting a shootout between all of them after the individual test reports are posted. The top three performers will then be identified.

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


    Continuous Current Discharge Graph
    C55006BE-FD26-4179-8816-538A9F826E5F.jpeg


    Ratings Graphic
    5565FCBA-9AB4-43A2-915D-C3FB40A75137.jpeg


    Performance Specs
    - DC Internal Resistance = 46.9mOhms (milliohms) average for the two cells.
    - Total energy delivered down to 3.2V at 10A continuous = 1.8Wh (Watt-hours) average
    - Total energy delivered down to 3.2V at 20A continuous = 0.9Wh (Watt-hours) average

    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
     
    • Like Like x 3
  2. sonicbomb

    sonicbomb Vaping Master Verified Member ECF Veteran

    Feb 17, 2015
    1187 Hunterwasser
    The wrapper is a pretty colour.
     
    • Funny Funny x 1

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