This is the 21700 size version of the Sony VTC6A. It performed essentially identically to the Samsung 40T which was given an estimated rating of 25A/35A and 4000mAh by me.
The Samsung 40T delivered a tiny bit more energy, Wh, at high current levels but the 21700 VTC6A ran a tiny bit cooler. Basically, they perform the same and are a fantastic choice for use at up to 20A-25A, in regulated or unregulated devices. At above 20A-25A the Samsung 30T is the better choice though due to its higher current rating and better efficiency (lower internal resistance).
This cell now has a tiny QR code square on the bottom. Perhaps an anti-counterfeiting measure?
If you have a VTC6A 21700, or one of its rewraps, that does not have this QR code it is probably an earlier sample. I have not tested them and I do not know their true ratings.
The two cells I tested delivered 4107mAh and 4131mAh at 800mA (0.2C) down to 2.5V.
I do not have the datasheet for this cell. I am TENTATIVELY ESTIMATING this Sony’s ratings to be 30A continuous and 4000mAh rated/minimum, 4100mAh typical/nominal.
Two cells were donated for the purposes of testing by Vapcell (http://www.vapcelltech.com). Thank you!
Ratings graphic: https://imgur.com/a/xEtjHGx
Test report: https://bit.ly/2OM431x
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These tests 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.
Any rating in my ratings tables can change at any time as different grade cells appear on the market, we get swamped with fakes, or new information becomes available to me. Please, never assume that the ratings in the tables are permanent and will never change! Always download the latest version before considering any cell purchase.
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