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Q: batteries ( Answered 5 out of 5 stars,   0 Comments )
Subject: batteries
Category: Miscellaneous
Asked by: edwin70-ga
List Price: $5.00
Posted: 07 Feb 2003 08:51 PST
Expires: 09 Mar 2003 08:51 PST
Question ID: 158481
Low temperature  (-20 to -40 C) characteristics regarding drop in
capacity as a percentage of nominal capacity of Nimh batteries
Subject: Re: batteries
Answered By: bio-ga on 07 Feb 2003 10:21 PST
Rated:5 out of 5 stars

The characteristics seem to vary from one manufacturer to other. I am
including the analysis of two major brands below:

You can find detailed characteristics of Energizer NiMH batteries at:

As seen in the Figure 12, discharge capacity highly varies with the
temperature. It goes about %20 of its nominal capacity at -20 degrees
Celcius. Quoting the site: "Use of nickel metal hydride cells in cold
environments may force significant capacity derating from
room-temperature values."

However, the data sheet for Panasonic NiMH batteries are somewhat

As you can see in "Discharge temperature characteristics" figure in
page 5 (second figure in the left column), the capacity ratio is about
60% at -20 degrees Celcius (when charged at the recommended constant
charging current).

Search strategy:
Searched Google for:
nickel metal hydride temperature discharge-capacity

Hope this helps
edwin70-ga rated this answer:5 out of 5 stars

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