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Caleb Kraft
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Re: Baghdad Battery
Caleb Kraft   12/5/2013 5:36:07 PM
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makes you wonder what other tech has stumbled because we didn't have the accompanying technology to make it a necessity.

Caleb Kraft
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Re: I'm guessing Atomic is out
Caleb Kraft   12/5/2013 5:35:01 PM
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Hydrogen cell! having a water powered robot would be incredibly fun to say regardless of the pain in the ass.

David Ashton
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Re: Charging Batteries
David Ashton   12/5/2013 4:15:40 PM
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@Ivan...I use a lot of NiCds and actually made up a "rejuvenator" for them to zap them with a high current for a short time, discharge, then zap again.  I did this with a  555 and entered it for the 555 competition a couple of years ago, the circuit is here:

http://stn564.hackhut.com/files/downloads/2011/02/555-NiCd-Battery-Rejuvenator.pdf

Mixed success, some batteries can't be fixed, but on some it works a treat.  You need to put a battery on the rejvenator for an hour or two, then give it a full charge at the normal rate.  I have specified 2C zap (ie a current of twice the AH capacity of the battery) but you can go to 5C or more for stubborn ones.

I just use a high current supply (eg a PC Power supply) but you can also use a capacitor to give the "zap".  I prefer a high current supply as it gives a more sustained and controllable zap.

Crusty1
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Re: Charging Batteries
Crusty1   12/5/2013 4:06:15 PM
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@Rgarvin640:Yes we used to manually use the lab power pack to step up the current to a dead NiCad untill the voltage started to drop and then discharge with a short, some times it would blow the short.

I have a lot of tales about battery use in London Underground Trains and before they were sold off Bus batteries.

I love the single cell lead acid batteries we used on the battery locomotives used to maintain track. They were very big 3 foot high an 1 foot deep float charged from the track 660 V DC during the day.

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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CEO
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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Rookie
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?

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