[pct-l] Battery Info - temp?

[ny74 at hotmail.com (Nathan Young)]

Hey Terry

Thanks for the battery details, they're right in line with what I've been 
experiencing in the field.

I was wondering about temperature effects on battery life.  They say 
Lithiums can handle the cold better.  Is that true?  I haven't had the 
chance to test this on my ski tours since everything battery operated that I 
carry is usually close to my body and its warmth all the time.  My tikka 
fails mostly from frozen buttons before I can see if the battery dies, and 
my Avy becon never leaves my body.


>From: "Terry Norton" <terry.norton@gmail.com>
>To: "The Mountain Goat" <themtgoat@yahoo.com>,"pct mailing list" 
><pct-l@mailman.backcountry.net>,kdpo@gottawalk.com
>Subject: Re: [pct-l] Battery Info
>Date: Mon, 13 Mar 2006 16:58:24 -0700
>
>For AAA batteries:
>
>Energizer AAA Alkaline: 11.5g each
>Energizer AAA Lithium: 7.6g each
>
>The total weight savings for a headlamp using 3 AAA batteries would be 0.4 
>oz.
>
>Lithiums are great in high current applications such as digital
>cameras, but one should  not expect the 3 -4 times life of alkalines
>in a headlamp.  With lithium batteries you will not observe the
>gradual dimming of the light seen with alkalines.  Lithiums perform
>much like the nicad batteries...The output falls of very quickly when
>the battery is almost discharged.  (Some newer LED headlamps have
>circuitry to prevent the fall-off in brightness.  In this case using
>the lithiums makes even less economic sense.)
>
>For the geeks in the crowd, the Lithium batteries have a capacity of
>1250mAh, and the alkalines have a capacity of 1000-1200 mAh at
>discharge currents of 100 to 20ma.  The life differenct in a
>relatively low current application such as an LED headlamp would not
>likely justify the approximately 3.7 times cost of the lithiums.
>
>(Walmart.com lists a 4 pack of AAA Energizer Lithiums at $9.83 or
>$2.46 / cell.  An 8 pack of AAA Alkalines is $5.36 or $0.67 / cell.)
>
>I will use AA lithiums in my camera since it is a high current demand
>device.  The old petzel tikka will get generic AAA batteries from
>Walgreens.
>
>cheers,
>terry
>
> > Head lamp - just alkalines...but used a common AAA size, glad to hear
> > that they now have AAA lithium!
> >
> > -Mountain Goat-
> >
> >
> > And for all you ounce weenies the Lithium batteries are lighter. I 
>weighed
> > them but cnanot find the data. I think they are each 1/2 ounce lighter. 
>If
> > you look far enough you can find AAA lithiums also. Lighter and last 
>longer,
> > but they cost quite a bit more.
> >
> > Ken
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