Are Eneloops Better Than NIMH In Cold Weather?

Started Jun 1, 2007 | Discussions
solarider Veteran Member • Posts: 4,690
Are Eneloops Better Than NIMH In Cold Weather?

I'm more than curious about this, as eneloops have better storage characteristics over NiMh batteries... are they any improvement in cold weather conditions as well?

I did ask this in another thread - but feel it a good question to ask here again.

thanks,

Nic

OP solarider Veteran Member • Posts: 4,690
Re: Are Eneloops Better Than NIMH In Cold Weather?

My apologies, I should have posted in another discuss group.

OP solarider Veteran Member • Posts: 4,690
Hi Phil

With your budget hopefully improving, is an edit button in the works for mistakes like mine?

thanks,

Nic

Cephalotus Veteran Member • Posts: 3,791
Re: Are Eneloops Better Than NIMH In Cold Weather?

seems so:

http://www.rc-network.de/forum/showthread.php?t=59430&page=2

text is in German, but the diagrams should be understandable

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BIJ001 Veteran Member • Posts: 5,567
Re: Are Eneloops Better Than NIMH In Cold Weather?

Some raw translation:

Jo, die eneloop sind sehr gut Kältetauglich.

Yeah the eneloop are winter-capable.

Hab meine eigenen Tests bei -15° gefahren
KAN1400/N3US/KR1100/eneloop.

I made my own tests on -15° (Celsius) with those.

Klarer Sieger in Sachen Spannung und Kapazität war letztere,
da kann auch die N3US nicht mehr mithalten.

A clear victory for the latter in voltage and capacity,
not even N3US could keep up with it.

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BIJ001 Veteran Member • Posts: 5,567
Re: Are Eneloops Better Than NIMH In Cold Weather?

I made my own tests on -15° (Celsius) with those.

5 Fahrenheit.

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OP solarider Veteran Member • Posts: 4,690
Re: Are Eneloops Better Than NIMH In Cold Weather?

Thank you for joining in with the info. Thats news to me... making this info ok for the news forum? ; )

Anyone else can add their 2cents on the subject?

BIJ001 wrote:
Some raw translation:

Jo, die eneloop sind sehr gut Kältetauglich.

Yeah the eneloop are winter-capable.

Hab meine eigenen Tests bei -15° gefahren
KAN1400/N3US/KR1100/eneloop.

I made my own tests on -15° (Celsius) with those.

Klarer Sieger in Sachen Spannung und Kapazität war letztere,
da kann auch die N3US nicht mehr mithalten.

A clear victory for the latter in voltage and capacity,
not even N3US could keep up with it.

BIJ001 wrote:

I made my own tests on -15° (Celsius) with those.

5 Fahrenheit.

Voyager13b Veteran Member • Posts: 3,392
Re: Are Eneloops Better Than NIMH In Cold Weather?

How could they be? They use the same chemistry, but with a different twist in construction.

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Voyager

hunter Senior Member • Posts: 1,337
Re: Are Eneloops Better Than NIMH In Cold Weather?

Am I the only one who doesn't have a clue what an "Eneloops" is? I use Lithium rechargeables instead of NIMH and have never had a prob in cold temps.

sherwoodpete
sherwoodpete Veteran Member • Posts: 7,766
Re: Are Eneloops Better Than NIMH In Cold Weather?

hunter wrote:

Am I the only one who doesn't have a clue what an "Eneloops" is? I
use Lithium rechargeables instead of NIMH and have never had a prob
in cold temps.

Eneloop and Hybrio are examples of recent NiMH batteries that are purchased fully-charged and can be used immediately without charging. They can subsequently be recharged like other NiMH cells, but retain charge for much longer when unused, so can be used for those devices which are infrequently used. Also means spare battery packs remain useful when stored for long periods.
Regards,
Peter

RickS Veteran Member • Posts: 4,579
Which rechargeable lithiums?

There are no AA rechargeable lithium batteries. Do you mean RCR-V3, a packaged pair of internal AA cell type batteries? RCR-V3s are Lithium-Ion chemistry and won't necessarily physically fit in all devices that use pairs of AAs. They also have to be used with care as most of them have voltages above what many manufacturers recommend for use in their devices that use AA batteries.

Eneloop is a brand of NiMH batteries from Sanyo that have ultra low self discharge rates, on the order of 5-10% per year instead of 10-20% per month common to typical NiMH batteries.

As for their efficacy in cold environments, the only data sheets I've found don't include that information.

My own general experience over the last six months with Eneloops have proven them to be excellent, but that didn't include anything to indicate their performance in cold temps.

Rick

hunter wrote:

Am I the only one who doesn't have a clue what an "Eneloops" is? I
use Lithium rechargeables instead of NIMH and have never had a prob
in cold temps.

Cephalotus Veteran Member • Posts: 3,791
Re: Are Eneloops Better Than NIMH In Cold Weather?

Voyager13b wrote:

How could they be? They use the same chemistry, but with a
different twist in construction.

The problem with NiMh in cold temperature is the low desorption rate (?) of H+ from the metallhydride.
(NiCd do not jave that problem, so they usually work much better in the cold)

with using a different metall or only a different structure you could improve that.

Most modern NiMh cells are optimized for maximum energy density (the mAg rating) and this comes with lots of compromises.

Quite similar to Mhz rating on processors and MP count on sensors btw

The best compromise is seldom that with the biggest number.

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