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RGARVIN640
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Shipping issues
RGARVIN640   12/5/2013 3:56:45 PM
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 Ivan: Some where in your articles it would be helpfull to discuss the shipping issues with different battery chemistryies. This is something that can catch both designers and PM's off guard, at least the first time they go thru it. :)

RGARVIN640
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Re: Charging Batteries
RGARVIN640   12/5/2013 3:53:46 PM
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Crusty1: There are many 'rejuvinator' devices that are used here in the states for large truck batteries. If you can get an extra couple of months usage out of a battery it is worth the 8-10 hours that the process takes.

eetcowie
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Re: Charging Batteries
eetcowie   12/5/2013 3:14:15 PM
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Also, Nickel Cadmium types were notorious for growing metal-fiber 'wires', that would partially short out a cell. There appeared a capacitor-based rejuvenator that would pulse a high-current into the cell to blow out the metal fibers and breathe new life. A similar treatment was touted to break loose sulfation in lead-acid cells. The applied voltage waveform shape and duration was critical to keep from doing too much damage. In some cases, it killed the remaining life, but was sometimes worth the risk.

Crusty1
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Re: Charging Batteries
Crusty1   12/5/2013 2:18:55 PM
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@Ivan Cowie: Spent a lot of my time in London Underground Research Labs testing all types of batteries, so I look forward to you articles.

I came across one Sealed lead acid charger that had the ability to get a dead battery back on it's feet, it was rumored that it used pulsed AC but I never got a look at the circuit.

 

Devad
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Re: when to discard or not
Devad   12/5/2013 12:50:39 PM
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Looking forward it and All About Batteries.  When I was in the workforce hardly any of the equipment used batteries.  Standby operation was a highlight when I retired.

eetcowie
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Re: when to discard or not
eetcowie   12/5/2013 12:42:41 PM
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'One man's trash is another man's treasure', so they say. I will cover what the manufacturer says is the end of its service life. Who's to say that it is really the end?

Devad
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Have you considered the question: When is it time to discard a battery ?
Devad   12/5/2013 12:06:37 PM
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This is mainly for non-rechargables (acctually it could apply to rechargable too).  Is there a standard load voltage drop vs load that's used to indicate the internal battery resistance is to high for practical use ?  Digital cameras tend to be very picky about power supply.   I've taken digitial camera batteries deemed BAD by the camera and used them succesfully in other less picky electronics. ( I wouldn't suggest using them in a  pace maker).    This begs the question: Are we discarding nearly good batteries ? Maybe recycling usefull batteries or worse sending them to the land fill.  

 

Brakeshoe
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Zinc-air cells
Brakeshoe   12/5/2013 11:38:58 AM
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As a hearing aid engineer (and one of 8.5 million users) I'm particularly interested in zinc-air technology, specifically with humidity. One engineer I know calls it a fuel cell, but nstead of pumping in O2 it extracts it out of the air.

chrisnfolsom
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Re: Baghdad Battery
chrisnfolsom   12/5/2013 5:31:13 AM
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Useful for what to whome?  That was the midevil period though so anything "strange" might have branded you a witch..  without Generators to charge batteries you couldn't do much - and we didn't have generators until 1873, but wow things cascaded quickly once we had power generation.

I am very interested in this subject and wish today's products would be made compatible with rechargable lithium cells running at 3.7v and normal alkalines at 1.5v so we could start having AAA, AA, 9V (3.7x3), etc pure lithium cells.  I know it might be somewhat tricky, but it would be nice to get rid of heavy, single use, low power density alkaline land fille batteries for good.  With the speed we replace electronics these day's it wouldn't take long.

David Ashton
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Re: Baghdad Battery
David Ashton   12/4/2013 7:10:30 PM
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@Betajet...  "it's hard to see why such a useful technology disappeared for so long"

It's because they didn't have cellphones and Ipods in those days :-)

 

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