LG IMR18650-HE2 vs Samsung INR18650-25R

[Macscroge]

Hello Everyone, first post.

I'm building a 48v 20Ah pack for a trike and I'm trying to decide on which cells to use. I've narrrowed it down to the two above, they seem the best suited to my application. Is there much difference between them? The samsung cells are €0.70 more expensive per cell, is it worth the extra money? The LG cell is 2500mah 20A, and the Samsung is 2500mah 20A.

Or are there better cells available that I've missed? I will probably be ordering from www.nkon.nl.


Thanks for you help.

 

[Punx0r]

According to Mooch's battery safety chart both cells have the same measured discharge capabilities, so the LG looks like the better buy. You might want to check the datasheet for each to see if there's a difference in cycle life and see if this is likely to be significant to you.

 

[redilast]

I'm not sure if they even make the HE2's anymore. My suppliers anyways have only offered HE4's in the last year or so... HE4 and 25R are basically about the same performance wise.

The HE2 on the other hand holds much higher voltage under load if you look at the tests here: http://lygte-info.dk/review/batteries2012/Common18650comparator.php

 

[Macscroge]

Thanks for the replies.

@redilast, The HE2 and the HE4 are actually almost the same age from what I've read, despite the naming. Nkon still has them listed at least, I'll have to see how many they have in stock.
Thanks for the link. That's very handy for comparisons.

 

[macribs]

Or are there better cells available that I've missed?

Well better is a loose term. There are batteries with higher C rate, and there are batteries with higher capacity. Then there are some that has both higher c-rate and more capacity. Look at samsung 30Q, Sony VTC 5 & 6, then there is the new Sanyo NCR20700B at 4250 mah at 20A. I think nkon stocked those 20700 last week. There is also a Sanyo Sanyo NCR20700 A, with iirc 3100 mah and 30A rate.

If you stick to 18650 rather then 20700 batteries iirc Sony VTC 6 got the highest capacity and continuous discharge rate.

 

[Hillhater]

Is the cycle life of the 20700A any better than the "B" version ?
The chart in the other thread. https://endless-sphere.com/forums/viewtopic.php?f=14&t=85113&p=1278596#p1278596
Suggests it loses 25% of its capacity within 200 cycles !

 

[Pajda]

Is the cycle life of the 20700A any better than the "B" version ?
The chart in the other thread. https://endless-sphere.com/forums/viewtopic.php?f=14&t=85113&p=1278596#p1278596
Suggests it loses 25% of its capacity within 200 cycles !

Did you notice that it is at 2C and 3C discharge rate? I am sure that cycle life of 20700 under standard conditions will be very good.