[time-nuts] Li-ion Battreries
EWKehren at aol.com
EWKehren at aol.com
Sat Jan 21 13:08:22 UTC 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
INR18650-35E_
(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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