[Top] [All Lists]

Re: Battery power and the cold

Subject: Re: Battery power and the cold
From: "James Huckle" catskinroyale
Date: Tue Dec 7, 2010 1:53 am ((PST))
Many thanks to everyone's help and advice.
I'll go for three times the usual amount and keep everything within outer
clothing where practical.


On 6 December 2010 18:26, Avocet <> wrote:

> > I also rigged an external battery pack that I kept inside my jacket
> > to keep
> > it warm(er).
> That's what we used to do in the BBC Film Unit. The cameraman would
> wear a battery belt, but with sound the alternative was usually a sync
> Nagra SN recorder under your outer clothing.
> I've looked at the Sanyo Eneloop battery specs and the voltage rapidly
> falls to 1.1V per cell at -20 C. You need to check the end voltage for
> your device. They don't say what the minimum temperature storage limit
> is, but if the electrolyte freezes in conventional batteries, they can
> be permanently damaged, so protect your spares.
> If in doubt, check your batteries (and gear) in a freezer first.
> Don't expect to get anywhere near the rated capacity when cold, and
> don't charge a frozen battery. The Sanyo graph shows a drop from 1800
> mAh to about 300 mAh, suggesting taking 6 times as many batteries than
> usual. I know this is plotted at a high current but do you need a high
> current to warm the cold battery up?
> David
> David Brinicombe
> North Devon, UK
> Cogito cogito ergo cogito sum - Ambrose Bierce
> ------------------------------------
> "While a picture is worth a thousand words, a
> sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause.
> Yahoo! Groups Links


<Prev in Thread] Current Thread [Next in Thread>

The University of NSW School of Computer and Engineering takes no responsibility for the contents of this archive. It is purely a compilation of material sent by many people to the naturerecordists mailing list. It has not been checked for accuracy nor its content verified in any way. If you wish to get material removed from the archive or have other queries about the archive e-mail Andrew Taylor at this address: andrewt@cse.unsw.EDU.AU