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Bench Test Results: Murata VTC4 18650...same as Sony VTC4, 23A 2100mAh

Discussion in 'Batteries and Chargers' started by Mooch, Jul 29, 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.

    15E621C6-A736-4D88-A997-2DBFF1F88F89.jpeg F7BD9F36-46F2-4B97-AEBA-4BDE0B23DAD5.jpeg DFBD23AF-0FD4-4A16-8898-3E6D7B13344D.jpeg 15026F21-E979-4719-880D-D2FE76F5ED1A.jpeg 49471693-7A52-4E4B-8384-922B8769EEDE.jpeg


    Bottom Line
    In September 2017, Murata Manufacturing Co., Ltd finalized the purchase of a lot of Sony’s battery operations, including the cells we use.

    Murata branded VTC cells are starting to become available to us and this was a test of the Murata VTC4. I’m happy to say nothing has changed, the VTC4 is still a decent cell. It even has the twin “dimples” on top of the cell, just outside the top contact, that all 18650 Sony VTC cells had.

    The two cells I tested delivered 2161mAh and 2164mAh at 420mAh (0.2C) down to 2.5V.

    I do not have the Murata datasheet but Sony rated the VTC4 at 30A continuous. It reaches over 95°C at that discharge level though, in my tests and in their tech info document graphs, which is too high in my opinion. That sacrifices cycle life for a higher rating. At 23A this cell reaches the same average temperature most cells reach at their rating.

    I am estimating this Murata’s ratings to be 23A continuous and 2100mAh.

    Two cells were donated for the purposes of testing by IMRBatteries (Earth's #1 source for IMR 18650 Batteries, Chargers, Cases & Wraps | IMRbatteries.com). Thank you!


    Continuous Current Discharge Graph
    F73F47A4-6EC9-4385-9759-B738BF430949.jpeg


    Ratings Graphic
    973C5CAB-63DF-40E6-9167-FE2906C60830.jpeg


    Performance Specs
    - DC Internal Resistance = 18.7mOhms (milliohms) average for the two cells.
    - Total energy delivered down to 3.2V at 10A continuous = 6.0Wh (Watt-hours) average
    - Total energy delivered down to 3.2V at 20A continuous = 4.0Wh (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. mimöschen

    mimöschen Ultra Member ECF Veteran

    Jul 15, 2016
    Looks like they use the chinese industrial standard for their ratings:evil::p
     
    • Funny Funny x 4
  3. Robin Becker

    Robin Becker Senior Member

    Feb 3, 2018
    Berlin
    Thanks Mooch...very interesting results...The VTC4 was so far a "Holy Cow" among vapers...looks like at 76 Degress this Holy cow turns into a Juicy Steak :thumbs:
     
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