Resonant Frequency EP 28 Shocking Ni-Cad

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Ni-Cad Battery Deep Dive

Ni-Cad Batteries
Opening Theme
01:02 Introduction
Greetings to the hams working the California forest fires.     
03:10 Feedback
Tim, KI6BGE, writes about his  first radio, a Yaesu FT-747GX, and his first hand-held, an FT-60R, and  other rigs.  He also asks about cross-band repeating through the  FT-8900R in his car.

Damon, NN7B, says Richard is his ham hero, and also listens to the Linux in the Ham Shack podcast. He was having a problem downloading the first episode, but that should be sorted out now.

Joe, NE2Z, enjoys both podcasts, and made a donation.  Thanks, Joe!
 Bob, KB3OQY, likes the podcast and learns something new in each episode.  He also made a donation.         

10:43 Donations
Thanks to Joe NE2Z and Bob KB3OQY  for their donations.  If you find anything useful in an episode of  Resonant Frequency, consider donating a dollar.  That's less than a  gallon of gasoline.         

Song "Voodoo Queen" by Tommy Dardar, from the album "Blues Fool"         
13:55 Buzzword
Memory effect - reality or myth?
If you partially discharge a nickel-cadmium battery (NiCad), and  recharge it, it may "remember" that point of discharge as it's fully  discharged state.  The best practice is to fully discharge a NiCad  battery pack before recharging, and avoid the use of rapid chargers.  A  related phenomenon is "lazy battery", where the battery appears to have a  full charge, but becomes depleted rapidly when put to use.  This is  often caused by frequent overcharging, and may be cured by several deep  discharge/recharge cycles.         

20:29 Song
"Wasn't That Enough" by Janiva Magness, from the album "Bury Him At The Crossroads"         

22:01 Topic
Nicad batteries.
This topic was suggested by several messages on the forums.
The abbreviation NiCad is a registered trademark of SAFT Corporation. Advantages: lower weight, good charging efficiency, smaller variations  in terminal voltage during discharge, low internal resistance,  non-critical charging condition.  In theory, a nicad battery may be  charged and discharged up to 1000 times.         
Comparison to Nickel-metal Hydride (NiMH)         

Disadvantages: higher cost,  toxicity, memory effect, and a negative temperature coefficient.  Nicad  cells are typically 1.2V, while alkaline cells are 1.5V.         

Charging.  The typical overnight  charge, called a C/10 charge, is accomplished by applying 10% of the  battery's total capacity for a period of 14 hours; that is, a 100 mAh  battery takes 140 mAh of energy to charge.         

Dendritic shorting.         

"Welfare Blues" by Kirk Fletcher, from the album "Shades of Blue"         

58:25 Conclusion
ail Richard at
KB5JBV on D-Star via port C on the NE5R repeater.

theme music is "Give It All Away", by midliFeCrisis, from the album "Live from the Loft"

Closing theme music is "We Gotta Go" by David Henderson at Podsafe Audio.                  

Glossary – See Glossary for terms used on the show.

Read More About Resonant Frequency: The Amateur Radio Podcast At

Contact Info For Richard KB5JBV:

About the Author

Richard KB5JBV has been an Amateur radio operator since 1988. He has held positions with the America Radio Relay League including but not limited to Assistant Section Manager, Official Observer, Official Relay Station, Official Emergency Station, ARES Emergency Coordinator for Kaufman County Texas, Volunteer Examiner and Technical Specialist in the North Texas section.

Richard has also served as RACES assistant radio officer for the city of Mesquite, Tx. and among numerous other duties Including club president for the HAM Association of Mesquite Texas.

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