[time-nuts] Li-ion Battreries

EWKehren at aol.com EWKehren at aol.com
Sun Jan 22 14:59:18 EST 2017

The reason I made the post is after bad experiences I found a vendor with  
genuine product and willingness to send you data sheets and my tests confirm 
 data within 3%. Can not ask for more. Can tell all the stories mentioned, 
been  there done it, that is why I felt it will be useful for time nuts. 
The Samsung data sheet is 752K otherwise I would attach. Claim 3350mA and  
100% at 0.2C that is what I tested and got 3327mA well with inn my test  
Bert Kehren
In a message dated 1/22/2017 12:45:41 P.M. Eastern Standard Time,  
holrum at hotmail.com writes:

I have a  LOT of experience in testing and using 18650 cells.   It is a  
horrible place for the un-initiated to be.  The market is so saturated  with 
dangerous fakes and inferior, over-speced cells that finding a genuine  cell 
is a vanishingly small probability.  Hopefully the seller mentioned  before 
pans out and sticks around.

You can be pretty much assured that  any no-name Chinese cell will be 
dangerous crap.   Buy a 3000 mAh  cell that is really 500 mAh and charge it at 
the 3000 mAh 1C rate and  KERBLOOIE!   If you want to buy decent cells from a 
reputable maker  (Samsung, Sony, Panasonic, etc) you have to be certified 
that you know how to  properly build with and use them...  and also the 
minimum order quantity  can be over 100,000 pieces.

Shop around and you can find sellers of  18650 shrink wrap sleeves for all 
the major/reputable cells.   I  have yet to test a Chinese cell that comes 
even close to its advertised specs.  Also probably 90+% of what is offered as 
genuine name brand cells are  fakes.

Your best bet for finding a decent cell is to get them from  GENUINE laptop 
packs.  That is easier said than done...  counterfeit  packs are the norm.  
 Also, most newer laptops use packs with pouch  cells.  18650's are on the 
way out for modern  machines.
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