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The Sony VTC5A is not a 35A battery!

Discussion in 'Batteries and Chargers' started by Mooch, Mar 15, 2016.

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  1. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    I've been getting a lot of inquiries about this battery. I hope to be testing it soon but wanted to address this.

    The Sony datasheet for the VTC5A shows a "Continuous Maximum Discharge Current" rating of 35A. But this is only if the battery temperature is kept at 80°C or lower! This means that 35A is not the continuous discharge rating as the VTC5 cannot complete a 35A discharge without going way over 80°C.

    That max continuous discharge current rating is just a capability, something the battery can do without suffering much damage, as long as you don't run it at 35A for too long. Otherwise it will overheat.

    Another thing to consider is that Sony wouldn't essentially create an entirely new battery, with a continuous discharge rating greater than any 18650 available in the world, and just call it the VTC5A. They would give it an entirely new model number.

    I think the VTC5A is just a tweaking of the VTC5 and will share most of its characteristics, including the VTC5's 20A continuous current rating. Similar to what was done by Samsung when they created the 25R5 to replace the 25R2. The capacity and current ratings stayed the same but the R5 version had a chemistry tweak to increase the cycle life of the battery, i.e., how many times it can be charged/discharged.

    There are some VTC5A test results online and they show a good 20A battery that gets quite hot by 25A. I'll know more when I get them in soon and start my testing.
    • Like Like x 9
  2. sig-cmt

    sig-cmt Ultra Member

    Sep 28, 2015
    HoustΩn, TX
    VTC5A, VTC6, HG6...Wonder what Samsung has up their sleeve in the near future...
    • Like Like x 2
  3. Canadian_Vaper

    Canadian_Vaper Vaping Master ECF Veteran

    Jul 30, 2015
    ON. Canada
    Yeah, a lot of the max ratings are actually micro pulse ratings and not continuous, you may be able to pull 35 amps but only safely if used for under 1 millisecond, its a big misconception.

    To get a battery to pull 35 amps there is no way it could be that energy dense, the chemical makeup just doesn't allow for it, it would have to be more around the 1500 maybe 1600 mah range.
    • Like Like x 2
  4. r77r7r

    r77r7r ECF Guru ECF Veteran

    Feb 15, 2011
    Tx for keeping us safe, Mooch!
    • Like Like x 2
  5. Frenchfry1942

    Frenchfry1942 Chillin' Verified Member ECF Veteran

    Jan 12, 2014
    Thank-you Mooch. You do a great service to our safety.
    • Like Like x 4
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