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Free nickel cadmium batteries on flebay.

 
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adam2
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Joined: 02 Jul 2007
Posts: 6209
Location: North Somerset

PostPosted: Wed May 31, 2017 9:08 pm    Post subject: Free nickel cadmium batteries on flebay. Reply with quote

Looks interesting.


I have no connection with the seller, but thought I would post here as may be of interest.
No battery lasts for ever, but these are among the longest lasting.http://www.ebay.co.uk/itm/Nickle-cadmium-wet-cell-batteries-/263014440606?hash=item3d3ce1de9e:g:iR0AAOSw42JZEvat

Edited to delete dead link and add new link.
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Last edited by adam2 on Thu Jun 01, 2017 3:35 pm; edited 1 time in total
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BritDownUnder



Joined: 21 Sep 2011
Posts: 238
Location: Hunter Valley, NSW, Australia

PostPosted: Wed May 31, 2017 10:44 pm    Post subject: Reply with quote

We have been using this type of battery on the current power plant project.
Some have failed even when supposedly 'new' due to being stored in a discharged state for too long. Two years in a discharged state and it is all over for these batteries we are using in Australia. Of course this is subjective and a battery that can hold one quarter of rated charge is still useful to someone - just not a power plant that wants 100% reliability.

The buyer needs to be aware that disposal costs for a large amount of 'free' dangerous, toxic cadmium metal may be significant.
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clv101
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PostPosted: Wed May 31, 2017 10:51 pm    Post subject: Reply with quote

BritDownUnder wrote:
The buyer needs to be aware that disposal costs for a large amount of 'free' dangerous, toxic cadmium metal may be significant.

I suspect this is why they are being given away 'free'.
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adam2
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Joined: 02 Jul 2007
Posts: 6209
Location: North Somerset

PostPosted: Thu Jun 01, 2017 3:43 pm    Post subject: Reply with quote

Apparently dead nickel cadmium cells can sometimes be recovered by changing the electrolyte.

The liquid consists largely of potassium hydroxide, this very slowly reacts with carbon dioxide in the air to form potassium carbonate.
With "new" cells that are supplied filled, it is not unknown for the electrolyte to be spilled in transit and topped up with water.

If in doubt, new electrolyte may be worth a try. There is meant to be a layer of oil floating above the liquid, so as to minimise contact with air and the carbon dioxide therein.
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BritDownUnder



Joined: 21 Sep 2011
Posts: 238
Location: Hunter Valley, NSW, Australia

PostPosted: Thu Jun 01, 2017 10:42 pm    Post subject: Reply with quote

adam2 wrote:
Apparently dead nickel cadmium cells can sometimes be recovered by changing the electrolyte.

The liquid consists largely of potassium hydroxide, this very slowly reacts with carbon dioxide in the air to form potassium carbonate.
With "new" cells that are supplied filled, it is not unknown for the electrolyte to be spilled in transit and topped up with water.

If in doubt, new electrolyte may be worth a try. There is meant to be a layer of oil floating above the liquid, so as to minimise contact with air and the carbon dioxide therein.


Yes we did a specific gravity check to see if water had been added, apparently it had not. We have sent some offsite to be 'reconditioned' and they did say that the electrolyte would get changed and cells would be 'washed'. Too much health and safety involved to get it done onsite in Darwin.

Looking at the photos of those sorry cells online in the advert I fear that they may not pass our tests even if the electrolyte is changed but it would do no harm.
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