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Bench Test Results: Lishen LR2170SF 13.5A 4500mAh 21700...best ultra-capacity 21700 but issues

Discussion in 'Batteries and Chargers' started by Mooch, Feb 28, 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, LG, Panasonic, Sanyo, or Molicel 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.

    You are responsible for your own safety! These batteries are designed and manufactured only for use in a battery pack with the proper physical and electronic protection. They were not designed for vaping (electronic cigarette) use or for use without battery pack protection circuitry. Use of these batteries is AT YOUR OWN RISK! 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.

    63C55CD2-64ED-4B4F-BCEE-F0FEACB5EC2A.jpeg 25826907-40FF-4E67-BA50-7706897B5DAB.jpeg 415B368E-9336-4CF4-B39D-771B69E6B3D7.jpeg 1B2C075C-31B2-4D64-9687-01CF59A2CCC8.jpeg


    Bottom Line
    This is a great cell, outperforming the Samsung 50E, Samsung 50E2, and LG M50T 5000mAh 21700 cells at 10A/30W and higher. At 10A/30W it runs cooler than all of them and delivers more energy (Wh) down to 3.2V. At 5A/15W though the Samsung 50E2 (not the 50E) slightly outperforms the Lishen LR2170SF.

    While it’s the best performing ultra-high capacity 21700 we can buy now it has two potential issues. The first issue is that it is a large cell and might not fit in chargers and mods that are already a snug fit with other 21700’s. The datasheet lists the LR2170SF’s dimensions as 21.7mm +/-0.2mm diameter by 70.9mm +/-0.2mm long. The two I tested measured 21.6mm in diameter and 71.0mm long.

    The second issue is its bottom venting feature. This can offer additional safety in case the battery is forced into thermal runaway as two vents (top and bottom) can help to keep the internal pressure down better than one. This can help prevent the cell from bursting as the top vent can sometimes become clogged during runaway.

    But, in a mod the negative contact presses hard against this bottom vent and this could prevent its proper operation. I do not know how much this might or might not affect whether the cell would burst if it was forced into thermal runaway but it does concern me. The top vent would still be functional though.

    The bottom vent could also be a concern for mechanical mod users. The bottom vent means this cell could vent from the bottom, or the top, or both the top and bottom if the cell was forced into thermal runaway. If a mech user is positioning the cell with its top towards the mech’s venting holes to try to help reduce the pressure inside the mech during thermal runaway just venting from the bottom could be a concern. You’ll have to decide if this is an issue for you or not.

    The two cells I tested delivered 4728mAh and 4791mAh at 0.9A (0.2C) down to 2.5V. This is typical consistency for cells from the non-Samsung/Sony/LG/Panasonic/Sanyo OEM’s.

    The cells I tested appear to meet their datasheet rating of 13.5A. Their internal resistance is low enough to be used all the way up to their rating fairly efficiently, about 40W.

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


    Continuous Current Discharge Graphs
    C55AA671-CFD0-4378-9359-49C431C9E193.jpeg 45E4C52C-B355-44F1-8DBF-0E7C0DBC99DC.jpeg


    Ratings Graphic
    79B95A3A-625A-431F-AB55-2124350140A0.jpeg


    Performance Specs
    DC Internal Resistance = 21.0 mOhms (milliohms) average for the two cells.
    Total energy delivered down to 3.2V at 5A continuous = 13.3Wh (Watt-hours) average
    Total energy delivered down to 3.2V at 10A continuous = 12.4Wh (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
     
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  2. sonicbomb

    sonicbomb Vaping Master Verified Member ECF Veteran

    Feb 17, 2015
    1187 Hundertwasser
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