Uses for a (almost) dead battery

To you knowledgable folks,
I have a 105ah 12v deep cycle battery that has met it's expiry date.
It met its expiry premature due to the fact that I bought one of those cases for it that have the buttons on it to show how much charge there is. Full/half/recharge etc and that button had be come stuck and drained the battery to 7v... And now it won't charge above 7.74v :)
Expensive lesson learned.
My question is though....:
I'm setting up some LED lights (build my own array with +/-3.v LEDs ) and thought, I might be able to use the battery for that purpose. Saving the new battery for the fridges etc. I guess I'd be using a lot of resisters but it would not be a total waste of a battery. Any thoughts on this?

Cheers
Marcel
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Reply By: Dennis Ellery - Wednesday, Jan 09, 2013 at 20:57

Wednesday, Jan 09, 2013 at 20:57
If it’s been discharged to 7.7 volts it is completely cactus – its only use is scrap lead
AnswerID: 502124

Follow Up By: Imanoone2u - Wednesday, Jan 09, 2013 at 21:15

Wednesday, Jan 09, 2013 at 21:15
I understand that it is 'cactus' for 12v uses, but how about the uses I mentioned in the original post?
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Follow Up By: Dennis Ellery - Wednesday, Jan 09, 2013 at 23:09

Wednesday, Jan 09, 2013 at 23:09
There is no way of knowing exactly – but I guess you will be carrying around 30 kilos of lead that won’t do as good a job as $5 worth Ni-MH rechargeables that weigh a 100 grams.
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Follow Up By: Member - Boobook - Thursday, Jan 10, 2013 at 07:08

Thursday, Jan 10, 2013 at 07:08
Come on Dennis what about
A torch that has low intensity so it doesn't scare animals and gets you fit at the same time, or a battery for a RC model submarine that is designed to go down to 5000meters ( you wouldn't even have to connect the wires.)

I must admit I can't think of any other uses though.

:)



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Follow Up By: John & Deborah G - Thursday, Jan 10, 2013 at 10:45

Thursday, Jan 10, 2013 at 10:45
Try putting a pulse device like "mega pulse" etc. and charge slowly using some type of regulated supply. I have had considerable luck recovering batteries that have appeared to loose their life in similar circumstances to yours.

Regards John G
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Follow Up By: Imanoone2u - Thursday, Jan 10, 2013 at 12:33

Thursday, Jan 10, 2013 at 12:33
Thanks guys.
John G, that might be something to try. I won't trow it out just yet..... Nor will I carry it around in my back-pack...lol

Again, thanks all for your help clearing this up.

Marcel
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Reply By: Hairy (NT) - Thursday, Jan 10, 2013 at 13:09

Thursday, Jan 10, 2013 at 13:09
Door stop?
AnswerID: 502148

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