Reviews of Sony Konion US18650V3

[schwibsi]

Now I'm curious, John.
Please post pictures of what you consider to be original Sony cells and point out the details that in your view make the cell shown a fake.
Apart from the large sticker I don't see it.

 

[Hillhater]

Apart from the "sticker" ..what other identifying markings are on these cells ?

 

[r3volved]

these guys here have some faint writing on them...
With a bit of photoshop, looks like it says:
top line: can't tell...
middle: "T V3A2JVE21N"
bottom: "Sony 31"

 

[cwah]

John, I have below rated capacity because I discharge only to 3V. icharger limitation doesn't allow me to go any lower. But 2100mAH at 3V doesn't seem too bad. Especially with my wiring creating higher resistance.

I'd guess I'll have the same results with the cells schwibsi is going to send me.


On the cell it's written:
SE 18650V3
T V3A2JVE21M
Sony 31

Probably something to do with manufacturing date.

 

[docnjoj]

Sorry if I missed it but at what rate did you D/C that cell in amps?
otherDoc

Whoops! I just saw the 2 amps rate. So that is 1C
Does anyone remember the C rate of the 18650V or VT and what D/C rate would it tolerate. The reason I'm asking is that I am still using 6 Fatpacks (12 ah) paralleled with a Ping 10ah and the system works fine on a daily basis in my wife's trike. The Ping is about 4 years old and the Fatpacks around 3.5 and it all still works for a total of about 19ah at about a 10 amp rate? The Fatpacks cells still are close in voltage even at this date without balancing. John?

 

[schwibsi]

The V3 is rated for a continuous discharge of 10A
The VTC4 for a continuous discharge of 30A.

 

[cwah]

Received schwibsi cells today:

I've put it next to one of mine. Can any of you spot the difference.

I tested impedance of each cell:
18650V3: 56mOhm
18650v3: 58mOhm
18650v4: 30mOhm

So results are IDENTICALS with my ones

Starting the same discharge test but I guess I'll end up with the same results...

 

[schwibsi]

Wow, shipping was very fast.
You may want to look into the difference between resistance and impedance and how to measure it.

In any case, real world voltage drop is what you what you really want to look out for.

 

[cwah]

I'm more into capacity.

I did few discharge test from 4.2V to 3V:
- 2000mAH at 5A discharge for V3 cells. Both of them. So identical capacity to the ones I have
- 1800mAH at 5A discharge for V4 cell.

I'm doing cycling them now and see how that goes...

 

[cwah]

Ok, first results from the cycling tests:

So it will go down from 2000mAH to 1500mAH after 500 cycles from 4.2V to 3V. Resistance is about 45mOhm and didn't change.

So it'll have 75% capacity after 500 cycles. And not 88% as advertised.