[time-nuts] Li-ion Battreries

EWKehren at aol.com EWKehren at aol.com
Sat Jan 21 08:08:22 EST 2017

In the seventies I used F size NiCad’s in applications  like OCXO’s later 
Rb’s for power backups. Later switched to Ni-MH in all cases  needed complex 
charge control and cutout to protect batteries. Today I have  switched to 
Li-ion mainly because of the low cost reliable power management  including 
protection of the cells. The repeated problem has been a reliable  source. 
Over the last couple of years I have spend more than $ 300 only to get  most 
the time junk, no real reliable sources. That has changed.   
Fasttech does offer cells that they have tested and is a  source for those 
living outside the US. Even though they claim shipping free  once you go to 
checkout you get hit with $ 29  shipping. 
After multiple trials I finally found a perfect US  source.  _genuinecells_ 
(http://myworld.ebay.com/genuinecells)  is located in Florida and my 
thought was if disappointed  I could afford to ship back. Gen responded to my 
request for information with  data sheets and additional information. I 
purchased  _2x  Samsung 35E 3500mAh 10A 18650 High Drain Rechargeable Battery  
(http://www.ebay.com/itm/112173495496?_trksid=p2060353.m2749.l2649&ssPageName=STRK:MEBIDX:IT)  for two reason 10 A load  and good price. These 
cells have no protection, which I want, since I will for  our applications  
stack 4 with a 4  cell controller and in two application also parallel cells 
for a total of  8.  I have now completed my tests  and concentrate my 
battery work on using these  cells. 
After having tested 26650 cells with disappointing  results my focus is on 
18650. I am sure there will be 26650 cells available, but  right now our 
focus is on 18650. 
I have no connection in any way with these two sources,  but think it may 
be helpful for those that look for batteris and do not want to  go through 
the process I went through.   
Bert Kehren 

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