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'Where find 3V cell in AA size?'
1997\11\27@100001 by Mel Evans

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Subj:   3V cell in AA size
Hi --
   I'm using a 16C54A in a 3-volt application, and the battery needs to fit
within
a "AA" holder.  It can be smaller than the cavity if there are spacers to
fit.
   The 54A sleeps most of the time, with an MCLR reset about once per
second,
so average current drain is about 1 microamp.  So battery life = shelf life.
Service life is ten years.  So with a lithium cell, I could solder it in and
seal it up.
An alkaline would need to be snap-in replaceable.
   The only thing I can find that fits is the Eagle-Picher LTC17C lithium @
$6.64
each in 100 lots.  Don't mind paying extra for lithium, but that's a bit
steep!
   Any suggestions?
-- Mel Evans    spam_OUTmevans1027TakeThisOuTspamaol.com

1997\11\27@124719 by Alec Myers

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face
Farnell Components in the UK sell Lithium and Lithium Thionyl Chloride
cells from various manufacturers (VARTA, Sonnenschein, Crompton), but
they're all about the same price for that quantity. SAFT also make them.

Also, have a look at:
http://www.varta.com:80/
www.duracellnpt.com/explor.d/litsumsh.html
www.electronet.com:80/bbase/mfg/m1295.htm
http://members.aol.com:80/solith/Appl-LMNO.html

There are 1.5v to 3v convertor chips, but the quiescent current is likely
to exceed what the PIC actually uses. Maybe there's a cunning method you
could combine with one of these.

I am interested to hear what your solution is - can you eMail or post it to
the list?

>    The only thing I can find that fits is the Eagle-Picher LTC17C lithium @
>$6.64
>each in 100 lots.  Don't mind paying extra for lithium, but that's a bit
>steep!

1997\11\28@024711 by ht

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face
At 09:59 27.11.97 -0500, you wrote:
>Subj:   3V cell in AA size
>    The only thing I can find that fits is the Eagle-Picher LTC17C lithium @
>$6.64
>each in 100 lots.  Don't mind paying extra for lithium, but that's a bit
>steep!
>    Any suggestions?

Saft LM14500 3V, 1900mAh @ 31SKr/$4.5 in 20 lots.

Havard
------------------------------------------------
HŒvard T¿rring
.....htKILLspamspam@spam@neo.no    xplisitspamKILLspamneo.no    .....simplisitKILLspamspam.....neo.no
Norsk Elektro Optikk A/S       Tel: +47 67974700
PoBox 384                      Fax: +47 67974900
1471 SkŒrer.
Norway

1997\11\29@072911 by johnb

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Mel Evans wrote:
>
> Subj:   3V cell in AA size
> Hi --  I'm using a 16C54A in a 3-volt application, and the battery needs to
fit within an "AA" holder.  So with a lithium cell, I could solder it in and
seal it up. An alkaline would need to be snap-in replaceable.

For 10-year life, Lithium is the only answer. Any catalogue shows that
an AA Lithium Thionyl Chloride cell costs about $6 and is generously
over-spec'd. But if you look at a Half-AA Lithium cell, it's about the
same price. Rule for cell capacity:

1 Ampere-hour = 114 microamp-years (or 11.4 microamps for 10 years).

A Lithium AA cell is about 2.2 ampere-hours. The only other thing that
seems to fit is 2 x Half-AA NiCads, 0.26 ampere-hours. The performance
would be very poor; although half the price of the Lithia, you would
soon make it up in apologetic phone calls.

John Blackburn,
South London UK.

1997\11\29@102121 by johnb

picon face
Mel Evans wrote:
> Subj:   3V cell in AA size

Lithium coin cells are worth looking at, as they are relatively low
cost.

The CR2032 (20mm dia x 3.2mm thick) has a capacity of 220 mAH, which is
25 micro-amp years.

Regarding cost: W H Smith (a large UK shop chain) sell the CR2032 at UKP
2.69 (4.3$), which is outrageous. They can be bought for half of this,
and a look at Trade catalogues shows them priced under a pound.

Reliability: coin cells have a type of seal known as "crimped", and has
a recommended life of around 5 years. For the highest reliability (10
years), "laser-sealed" cases are used, mainly on cylindrical cells. Many
brands of cells use Sanyo patents for the seal (and no doubt for other
chemical features).

Current Drain: Varta (for example) recommends a max continuous drain of
3 mA.

I was given a tiny Chinese FM radio (for cycling use). It uses a CR2032
and consumes 12.8 mA. The cell supplied was by Maxell. The radio gave up
after 3 hours. Its voltage is now 2.4 volts (initially > 3V), and it
hasn't recovered. A pity. This radio is cheap, neat and useless. I shall
be fair to it and try a new cell. Meanwhile it's back to the Walkperson,
which is huge, but cheaper to run.

John Blackburn,
South London UK.

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