At 05:15 PM 2001.06.01 -0400, you wrote:
>Has anyone used the new Energizer E2 Lithium 2CR5 in their EOS. I am
>wondering if it is safe due to warnings not to use lithium batteries in the
>accessory battery packs.
>
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Lithium Batteries..... There are 9 Lithium based chemistries listed in
my battery reference book, so just seeing the word Lithium means little.
Of the various types, only three are of any importance to photography
today, While lithium is used as the Anode element, the Cathode is
composed of other materials, and the relationship between these two
components as well as the electrolyte give the battery its characteristic
voltage and total energy capacity.
All three of these following types are referred to as "Lithiums".
Lithium-Manganese Dioxide (liquid electrolyte, solid Manganese Dioxide
cathode)
This is by far the most common, nominal open circuit voltage of 3.0 volts.
This is the battery which powers our EOS cameras, in the form of 2CR5 dual
cells (two three volt cells in series), or CR123 single cells (one half of
a 2CR5) and is also the common three volt coin cell used in watches,
calculators etc.
Lithium- Iron Disulfide (liquid electrolyte, solid Iron Disulfide cathode)
This is the Eveready "AA" L91 penlight cell. which has an open circuit
voltage of 1.5 volts These are not the same as the above batteries, they
are however the type which raises some concerns when being used in the
battery packs of older equipment, as they do appear to provide more than
their nominal open circuit voltage (greater than 1.5 volts), They are
therefore a concern for some equipment that may not like even a little bit
of excessive voltage.
finally,
Lithium Thionyl Chloride (liquid electrolyte, liquid Thionyl Chloride
cathode).
These are the batteries that provide backup power for most computer's boot
set-up information, keep the time of day clock running when the computer is
off, and most other applications where ultra low power drain, extreme long
battery life is needed. Open circuit voltage is 3.6 volts. and come in
both tubular and coin shapes plus others.
Edward Agnew, P.Eng., VA3 EGA
Agnew Technologies Inc.
Electronic Engineering and Stock Photographic Services
Campbellville, Ontario Canada
Voice: 905.659.0429
Fax: 905.659.0474
http://www.agnew-tech.com
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