(no subject)

[Paul Gates]

To all..... I ordered 8 rechargable batteries from ZBattery at a good price.
I have stayed away from rechargable batteries because of the 1.2 volts per
AA battery. However these are the high capacity batteries <<2450 amp hr.>>
What do you think for my K1? At 9.6 volts I am not sure what power output I
will have... If it doesn't work out for the K1 I can always use them in my
dig. camera!
Paul Gates
Elecraft K1 #231
XG1
[hidden email]
"An idle mind is the devil's workshop."
And the devil's name is Alzheimer's!
_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[G3VVT]

 
In a message dated 31/05/05 08:37:43 GMT Daylight Time, [hidden email]  
writes:

To  all..... I ordered 8 rechargable batteries from ZBattery at a good price.
 
I have stayed away from rechargable batteries because of the 1.2 volts per  
AA battery. However these are the high capacity batteries <<2450 amp  hr.>>
What do you think for my K1? At 9.6 volts I am not sure what  power output I
will have... If it doesn't work out for the K1 I can always  use them in my
dig. camera!



Hi Paul,
 
Presume you meant 2450mAhr AA size.
 
2450Ahr is something quite huge that unless the very latest high capacity  
(and expensive) block NiMh cells are used, would entail you using a  trailer to
haul them about. We had 3750Ahr 2V lead acid batteries cells in  the workplace
com site's solar powered battery plant and they were big!
 
The 2450mAhr AA version is as you say very usable in digital cameras, but  
you do need to keep them charged up as they seem to gradually go flat if left in
 the camera for a long period of time. Another downside is the increase in  
capacity had brought on a very definitely noticeable rise in weight.
 
Bob, G3VVT
_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[Pieter Meiring-2]

> In a message dated 31/05/05 08:37:43 GMT Daylight Time, [hidden email]
> writes:
>
> To  all..... I ordered 8 rechargable batteries from ZBattery at a good
> price.
>
> I have stayed away from rechargable batteries because of the 1.2 volts per
> AA battery. However these are the high capacity batteries <<2450 amp  hr.>>
> What do you think for my K1? At 9.6 volts I am not sure what  power output
> I will have... If it doesn't work out for the K1 I can always  use them in
> my dig. camera!
>
>
>

My 2c worth:

Modern high capacity NiMH batteries (I have about 30 of them, up to 2500mAh AA
size, for camera, CD player, GPS, etc...) seem to have to following
characteristics:
* Fully charged voltage of about 1.35V
* After initial current drain, this drops to about 1.25V and stays there until
about 90% drain.
* They lose about 10% of their charge per week on the shelf.
* They ideally need an "intelligent" microprocessor controlled charger for
best results.
* The largest capacity AA ones are quite a tight fit into AA holders.

In my experience, rechargeable NiMH AA batteries are better than Alkaline
cells despite their lower initial operating voltage. Alkaline cells drop
their voltage more rapidly in the second half of their discharge cycle and
tend to give lower power overall. I tend to make up a battery with an extra
cell to offset the voltage difference.

Lithium cells have a higher capacity and hold their voltage well throughout
the discharge cycle but are a bit more expensive.

Li-Ion/Li-Polymer rechargeable cells are not, as far as I am aware, available
in AA size commercially (yet) and also have other problems. They need a
special dedicated charger and cell life is limited to 18 months to  2 years
regardless of use due to cell degradation.

Pieter
_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[EricJ-2]

They will work fine with the K1. I use a set of MAHA 2700 mah batteries in
mine almost every weekend.

Here is a little chart I made up and laminated to stick on the K1 which
shows the most efficient Power Output vs. Battery Voltage. Keep tabs on your
battery voltage with the built-in voltmeter and adjust power accordingly.

V       Po
8.0     2.6
8.5     2.9
9.0     3.2
9.5     3.6
10.0    4.0
10.5    4.4
11.0    4.8
11.5    5.3
12.0    5.8
12.5    6.3
13.0    6.8
13.5    7.3


Eric
KE6US

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Paul Gates
Sent: Tuesday, May 31, 2005 12:37 AM
To: elecraft
Subject: [Elecraft] (no subject)

To all..... I ordered 8 rechargable batteries from ZBattery at a good price.

I have stayed away from rechargable batteries because of the 1.2 volts per
AA battery. However these are the high capacity batteries <<2450 amp hr.>>
What do you think for my K1? At 9.6 volts I am not sure what power output I
will have... If it doesn't work out for the K1 I can always use them in my
dig. camera!
Paul Gates
Elecraft K1 #231
XG1
[hidden email]
"An idle mind is the devil's workshop."
And the devil's name is Alzheimer's!
_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com
_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com