[Elecraft] Source of NiMH cells?

[Mark Petiford]

Matt,

That would explain why, on the Yahoo Group, we were seeing complaints of a cell or two out of eight, failing right out of the box!!!  I was amazed at that.

FYI, All Electronics sells a Tenergy cell that is a D size cell with a capacity of 10,000 maH:

http://www.allelectronics.com/make-a-store/item/NMH-D/NIMH-RECHARGEABLE-D-CELL-10-000MAH/1.html


I don't have one, but they do not appear to be AA cells in a D size sleeve...not with that capacity!  They won't fit in a KX3, but I had thought I might build a tube of these as an external battery pack.  Unfortunately, I don't think it would be much less expensive than a similar size pack of LiFePo cells.  I wouldn't have to buy the balanced charger, but would have to make up a constant current charger myself...or else charge with a variable voltage power supply while manually adjusting the voltage to keep the current relatively constant.  Makes the newer lithium technology look better and better.  


Now, if I could just get myself to trust Lithium technology enough to charge them in my living room...


Mark
KE6BB
(Hoping someone can convince me).




________________________________
 From: Matt Zilmer <mzilmer at verizon.net>
To: Mark Petiford <rv6amark at yahoo.com> 
Cc: Elecraft Reflector <elecraft at mailman.qth.net> 
Sent: Thursday, June 27, 2013 2:29 PM
Subject: Re: [Elecraft] Source of NiMH cells?
 

Hi Mark,

You caught me in the middle a battery research project (day job) and I
found some dirt on Rayovac -literally-:ALK and NiMH both.  Pretty
severe manufacturing issues, though the details about the
contamination weren't spelled out.  No CPSC issues though, so they're
still in business.

It got so bad that Rayovac has to put a banner on all retail blister
packs:  "Lasts As Long As Duracell" or some such.

Everyone seems pretty pleased with the Eneloops, so that's good.  I
used them on the KX3 for a while, then ran a few tests and ended up
with Tenergy Premium.  To each his own!

73,
matt W6NIA

On Thu, 27 Jun 2013 14:13:40 -0700 (PDT), you wrote:

>Correct, Matt.  I am actually running Panasonic HHR210AAB cells right now, which appear to be Enelooops with a different jacket, based on my research.  We used them in my work, but only recharged them a few times, so I was able to get them cheap, and they work well.  I have a lot of experience with Eneloop 2000 maH cells at home...probably a more severe environment than my work!  They seem to be very forgiving so long as you don't discharge them below 0.9 volts per cell.
>
>I think early this year, we were seeing a lot of out of the box "infant mortality" with the Rayovac rechargeable NiMH cells.  Not sure if that is still a problem.
>
>Mark
>KE6BB
>
>
>
>
>________________________________
> From: Matt Zilmer <mzilmer at verizon.net>
>To: Mark Petiford <rv6amark at yahoo.com> 
>Cc: Rose <elecraftcovers at gmail.com>; Elecraft Reflector <elecraft at mailman.qth.net> 
>Sent: Thursday, June 27, 2013 12:51 PM
>Subject: Re: [Elecraft] Source of NiMH cells?
> 
>
>Just to be clear, there are Sanyo's Eneloops out there at retail, but
>also a line of Sanyo commercial cells generally sold only as OEM
>product.  I had a 14.8V pack built from the latter: 39 WH - so good
>for several days of KX3 CW ops.
>
>73,
>matt W6NIA
>
>On Thu, 27 Jun 2013 12:43:07 -0700, you wrote:
>
>>The Sanyo's are also known as Eneloops.  Be sure to get 2000mah or higher capacity cells.  
>>
>>Mark
>>KE6BB
>>
>>Sent from my iThingie.
>>
>>On Jun 27, 2013, at 11:56 AM, Matt Zilmer <mzilmer at verizon.net> wrote:
>>
>>> Sanyo, Tenergy, Powerex, Imedion, Panasonic, etc.
>>> 
>>> matt W6NIA
>>> 
>>> On Thu, 27 Jun 2013 18:51:22 +0000, you wrote:
>>> 
>>>> I'm guilty of not paying much attention to reflector
>>>> chatter concerning batteries, as I didn't expect to
>>>> need any. (:-)
>>>> 
>>>> Now I have a new KX3 (S/N 4437) and find I need
>>>> a set to keep the clock running when it's off 12V.
>>>> 
>>>> Who's a good source?
>>>> 
>>>> 73!
>>>> 
>>>> Ken - K0PP
>>>> kengkopp at gmail.com
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