Sony US18650NC1 experience

[jayx]

I plan to build a 10S3P or 10S4P pack, Sony US18650NC1 cells seems to be suitable as I’m going to draw normally around 1C, 2C at peak, and more interested in high capacity and how long cells retain it. From the graph available in this thread http://endless-sphere.com/forums/viewtopic.php?f=31&t=56333&p=841205&hilit=US18650NC1#p841205 it looks pretty good (~80% after 500 cycles), but not sure it’s true. Also in mentioned thread emcee said he bought and test these cells, but capacity wasn't quite as it suppose to be. Has anyone got experience with these cells?

 

[zener]

Panasonics 3400mah cells are currently the best 1C high cappacity cells.
They have excellent callendar and cycle life and are the currently highest cappacity available.
But are limited to 1C const - 1,5C peak.

 

[jayx]

Yes NCR18650B looks good, but again is it based on real life experience or some graphs/datasheets? Anyway 1.5C is not enough really...

 

[zener]

Datasheets
http://www.dampfakkus.de/akkuvergle...9&akku3=498&akku4=102&akku5=353&akku6=491&a=3
Clik on 2A 3A 5A and you will see that US18650NC1 is not so good.
Note that you can discharge the NCR18650B to 3V and the ICR18650D1 only to 3.3V @3A.
Someone here on E/S has build a ICR18650D1 pack some time ago maybe you could ask him how it has performed over the time.

 

[jayx]

Cheers for the link, certainly graphs for LG ICR18650D1 are looking very nice. I guess post from that person who built a pack out of ICR18650D1 is this one:
http://endless-sphere.com/forums/viewtopic.php?f=14&t=52710
Now I'm confused, too many choices...

 

[district9prawn]

Cheers for the link, certainly graphs for LG ICR18650D1 are looking very nice. I guess post from that person who built a pack out of ICR18650D1 is this one:
http://endless-sphere.com/forums/viewtopic.php?f=14&t=52710
Now I'm confused, too many choices...

To add to the confusion, Samsung now has a 3200mah 4.35v cell. And there is a 3200mah version upgrade of the LG D1 cell.

 

[Allex]

Forget D1, they deliver poor power.(but have lots of capasity) and are old. Sony are good but only 2000Ah
Newer and better cells are out there.
Take new samsung 25r or new LG 18650HE2 2500mAh 35A Discharge

Here is the thread
http://endless-sphere.com/forums/viewtopic.php?f=14&t=57291

 

[jayx]

But I don't need the power. That's why I said on the beginning I'm unlikely to need more than 2C (even taking capacity loss into account). For power I'd go for A123 - there's nothing better, plus have excellent lifetime. But they lack of capacity.
What I'm trying to find is the best balance between capacity / cycle loss (at discharge rates up to 2C) and D1 may not be that good, datasheet says 75% after 300 cycles but only @ 0.5C. I don't think it's going to be better than NC1 for rates 1-2C.
Is the new technology providing better lifetime? Certainly more power. Unfortunately datasheets seems to be focused on hi C rates and don't say what is capacity loss on low, that's really annoying it's not specified. For high discharge rates (15-20A) from the graphs for 25R or HE2 looks like it's about 75% (1800mAh) capacity left after 300 cycles. At lower rates it should be more, so I guess the answer is yes.

 

[Allex]

Yepp thats about it, is is a yes. If you take a high output battery it will live longer if you only use it at 2c