[Elecraft] AA primary cell (K1 related) capacity

Wed Jun 19 10:36:00 2002

Hi

Yes you are correct about alkaline batteries and high currents. Here is a=
 site that goes into great detail on the testing of batteries in high cur=
rent demand applications. Note how the alkaline batteries compare to the =
NiMh. =20

http://www.imaging-resource.com/ACCS/BATTS/BATTS.HTM

The performance of NiMh batteries is also very dependant on the charger u=
sed. The Maha c204f is the one I use and it works very well although it w=
ill only charge 4 at a time in about 3 hours. At only $23 each you could =
buy two. The ultimate is the Maha MH-C777+ this charger will charge just =
about any battery pack up to 12 cells NiCad NiMh NiLion.

http://www.mahapowerex.com/maha-mh-c204f.htm
http://www.mahapowerex.com/mh-c777plus.htm

Don Brown
KD5NDB
----- Original Message -----
From: Mark J. Dulcey
Sent: Wednesday, June 19, 2002 7:49 AM
To: Steve Jackson
Cc: [email protected]
Subject: Re: [Elecraft] AA primary cell (K1 related) capacity

Steve Jackson wrote:
> Does anyone know what a modern alkaline AA-size primary cell is rated f=
or,
> in Ampere-hours?  Ttrying to do some back-of-an-envelope comparisons be=
tween
> 1800 mAh NiMH cells and Duracell/Energizer class cells.

One site I checked claimed 2800 mAh. Other sites seem to give numbers in
the same neighborhood.

However, alkaline batteries aren't nearly as good at handling high
current rates as NiCd or NiMH, so the capacity drops faster at high
discharge rates. Here's a page with a link to a chart that shows the
effect: http://www.greenbatteries.com/documents/Battery_FAQ.htm  The net
result is that an alkaline pack would probably outlast a good NiMH pack
by about 50% in receive-only use, but might actually last LESS time if
used for a session that included a lot of transmitting.

_______________________________________________
Elecraft mailing list: [email protected]
You must be a list member to post to the list.
Postings must be plain text (no HTML or attachments).
See: http://mailman.qth.net/mailman/listinfo/elecraft
Elecraft Web Page: http://www.elecraft.com

--- StripMime Report -- processed MIME parts ---
multipart/alternative
  text/plain (text body -- kept)
  text/html
The reason this message is shown is because the post was in HTML
or had an attachment. Attachments are not allowed.
Please post in Plain-Text only.---