Ni-Cad Battery Deep Dive
00:00 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. 13:00 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. 39:06 Comparison to Nickel-metal Hydride (NiMH) 40:42 Disadvantages: higher cost, toxicity, memory effect, and a negative temperature coefficient. Nicad cells are typically 1.2V, while alkaline cells are 1.5V. 45:11 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. 53:53 Dendritic shorting. 56:07 Song "Welfare Blues" by Kirk Fletcher, from the album "Shades of Blue" 58:25 Conclusion ail Richard at firstname.lastname@example.org itter.com/kb5jbv 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.
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