Call Search
     

New to Ham Radio?
My Profile

Community
Articles
Forums
News
Reviews
Friends Remembered
Strays
Survey Question

Operating
Contesting
DX Cluster Spots
Propagation

Resources
Calendar
Classifieds
Ham Exams
Ham Links
List Archives
News Articles
Product Reviews
QSL Managers

Site Info
eHam Help (FAQ)
Support the site
The eHam Team
Advertising Info
Vision Statement
About eHam.net

   Home   Help Search  
Pages: [1]   Go Down
  Print  
Author Topic: NiCAD battery storage? Charged or discharged?  (Read 780 times)
KA1MZY
Member

Posts: 29


WWW

Ignore
« on: July 22, 2007, 11:02:18 AM »

Is it better to store a Nicad battery ( For an HT ) discharged, or fully charged if it's not getting used for months at a time?

Logged
AA4PB
Member

Posts: 12990




Ignore
« Reply #1 on: July 22, 2007, 11:38:05 AM »

You always want to store batteries charged. The problem is that they discharge themselves over time so you need to keep recharging them from time to time, even when not in use. Professional users often keep the batteries connected to chargers that automatically cycle and monitor the batteries in an attempt to ensure that they are ready for action.

I've come to the conclusion that Ni-CAD is often not the best technology for a situation where radios sit for many months and then suddenly need to be used. For occasional use some HTs offer an optional battery pack that uses non-rechargeable alkaline batteries. This may provide better reliability IF you keep a fresh supply of batteries on hand. The down-side is that for a given size an alkaline can't supply as much current as a Ni-CAD.
Logged
KE3WD
Member

Posts: 5689




Ignore
« Reply #2 on: July 22, 2007, 08:25:54 PM »

Try charging 'em up, then storing in a sealed plastic bag with a dessicant bag inside, in the refrigerator.  

Important -- warm to room temperature slowly before attempting to use, and then charge 'em again first.  


.
Logged
KA1MZY
Member

Posts: 29


WWW

Ignore
« Reply #3 on: July 23, 2007, 12:10:10 AM »

Interesting replies!  I've got a NiMH battery for my D7a which is connected to the radio most of the time because it offers a lot more run time. If I'm going to transmit, I usually plug it in to the AC adapter

I don't do a whole lot of talking, but I listen most of the time when at the computer and found I have to charge the nicad battery a lot more often than the NiMH. I figured I would find out if I should leave it charged, or discharged to extend the life of it sine I'm not using it.
Logged
KE3WD
Member

Posts: 5689




Ignore
« Reply #4 on: July 23, 2007, 08:29:45 AM »

NiCads like to be excercised.  

This is the "memory effect" inherent in the NiCad design.  

For longest lifetime it is best to charge the NiCad fully every time and then discharge it fully every time to avoid the buildup of internal shorting crystal growth that causes the "memory effect" -- a situation where the battery will hold less and less charge over time.  

NiMH chemistry does not suffer from that memory effect at all and therefore is the better solution these days IMO.  You can half charge them, leave them on the charger while operating, discharge them at different rates and not have to be concerned about discharging them all the way down or anything of the sort.  

Full charge and store at lower temperature is one way to keep any chemical cells longer, that's why I told you about the refrigerator.  Still an endpoint to that one, too, nothing is forever, but chemical action is simply slower at lowered temperatures.  


.
Logged
Pages: [1]   Go Up
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.11 | SMF © 2006-2009, Simple Machines LLC Valid XHTML 1.0! Valid CSS!