battery ratings

[Joe Cougar]

Hi. I decided to start using ni-cad rechargable AA size batteries
around the house but I notice that they are 1.2 V instead of the 1.5
volts of the regular type. Will this cause any problems and why is this?
Much thanks- Joe

 

[JeffM]

using ni-cad rechargable AA size batteries around the house
but I notice that they are 1.2 V instead of[...]1.5 volts
Will this cause any problems ?
Joe Cougar

Depends on your application.

If you have a Walkman that is expecting 3.0V
and you have it starting at 80% of that, expect it to show.

I encountered some portable air sampling units.
The front page of the user's manul said in big letters
ALKALINE BATTERIES ONLY.
Some genius though he would save the company some money
and put in NiCds. They failed calibration.
Giving the rechargables to some folks to use in their flashlights
and following the manufacturer's specs
got the fans turning at a the proper speed and they passed.

OTOH, the discharge curve of rechargables is FLAT.
They work the same until they suddenly don't.
Their internal resistance is very low
and thay can deliver tremendous current.
NEVER SHORT ONE OUT.

 

[Joe Cougar]

Depends on your application.

If you have a Walkman that is expecting 3.0V
and you have it starting at 80% of that, expect
it to show.
-------------------------

Thanks. Just using them in remote controls for entertainment
center,optical mouse for computer,and a few other non-motorized apps.
I was given this charger and I tested out the well used batteries that
came with it and tossed then out when they tested 1.3 volts. Now I have
purchased new ones but I can't understand why they would call them AA
and have a different voltage.-Joe

 

[Jasen Betts]

On 2006-03-31, Joe Cougar <elcapitan25@webtv.net> wrote:

Hi. I decided to start using ni-cad rechargable AA size batteries
around the house but I notice that they are 1.2 V instead of the 1.5
volts of the regular type.

some are 1.25.

Will this cause any problems and why is this?

Some appliances may not work, none will be damaged.
most appliances will work correctly.

The voltage comes from the chemicals used in the cell.

Bye.
Jasen

 

[John Fields]

On Fri, 31 Mar 2006 18:49:28 -0800, elcapitan25@webtv.net (Joe
Cougar) wrote:

Depends on your application.

If you have a Walkman that is expecting 3.0V
and you have it starting at 80% of that, expect
it to show.
-------------------------
Thanks. Just using them in remote controls for entertainment
center,optical mouse for computer,and a few other non-motorized apps.
I was given this charger and I tested out the well used batteries that
came with it and tossed then out when they tested 1.3 volts. Now I have
purchased new ones but I can't understand why they would call them AA
and have a different voltage.-Joe

---
"AA" refers to the physical size of the cell.


--
John Fields
Professional Circuit Designer

 

[Brian Gregory [UK]]

"Joe Cougar" <elcapitan25@webtv.net> wrote in message
news:24940-442DEA38-535@storefull-3237.bay.webtv.net...

... Now I have
purchased new ones but I can't understand why they would call them AA
and have a different voltage.-Joe

You don't get to choose what voltage a battery is other than by making a
different type of battery. If it's a Ni-Cad or a Ni-MH it'll always be 1.2V
(or a multiple of it for multi cell batteries).

Some devices don't work well with only 1.2V however this is extremely shoddy
design since throwing away a 1.5V battery when it's only run down to 1.2V is
very wasteful since they usually have plenty of energy left in them at that
point. However devices do get designed that way. For instance I've tried
several digital cameras that were exceeding poor in this respect.

--

Brian Gregory. (In the UK)
ng@bgdsv.co.uk
To email me remove the letter vee.

 

On Fri, 31 Mar 2006 18:49:28 -0800, elcapitan25@webtv.net (Joe Cougar)
wrote:

Thanks. Just using them in remote controls for entertainment
center,optical mouse for computer,and a few other non-motorized apps.
I was given this charger and I tested out the well used batteries that
came with it and tossed then out when they tested 1.3 volts. Now I have
purchased new ones but I can't understand why they would call them AA
and have a different voltage.-Joe

AA is the physical size and 1.2 is normal for a nickel metal hydride
or nickel cadmium cell.

The rechargeables self-discharge a bit faster than alkaline batteries
so a remote control is probably not the best application unless you
use it constantly. Some remotes operate better on the slightly higher
voltage of an alkaline battery.

They are well suited to digital cameras that eat batteries or
flashlights.
--

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