What are possible uses for weak batteries?

A followup on my previous question, sort of...

I have about 150 old semi used 1.5v AA batteries that don't have enough juice in them anymore to power anything significant.
One can only have so many Joule thief powered LEDs, and it's a shame to dispose of them all. 

So the question is, what would YOU do (*Pointing at you!*) with those batteries?

Thanks for any and all suggestions!

P.S.
Please provide an instructable if applicable :D

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if you break them open and break up the black material around the center rod, you can mix it with hydrogen peroxide and you will form pure oxygen.
You know those potato guns or air cannons? they are easy to make and you have 150 bullets. :-)
Morgantao (author)  liquidhandwash4 years ago
I'm not gonna shoot the batteries. Ground water is polluted enough.
I was joking
Morgantao (author)  liquidhandwash4 years ago
Good :)
I think they would fit in a 1/2 inch PVC pipe.
One thing we have not seen on CSI (In case you don't know the show its an American show about Crime scene investigation) is death by battery. "Somebody put a AA energizer through his heart, he didn't keep going after that."
Vyger Vyger4 years ago
I just checked, 3/4 inch with a space left.

Oh the things that come to mind, "He expired but his battery is still good for another year".

He's dead Jim, and so is his double A.

"He had a double A bypass the hard way"

"I think the Bunny did it."

"He really needed to recharge."

This question is number 7 in the Google search results for "death by double A battery"
Morgantao (author)  Vyger4 years ago
I like those punch lines. They are very CSI like indeed :)
Vyger Vyger4 years ago
Sorry, Google search is not this question but instead another very much like it.
blkhawk4 years ago
Recycle!
Morgantao (author)  blkhawk4 years ago
Unfortunately, where I live they don't exactly recycle old batteries, they bury them in special (toxic material) landfills. :(
That's why I said it would be a shame to dispose of them.
Well, if you decide to open them up you will be exposed to toxic chemicals. Do you have the proper gear to handle the chemicals you will be exposed to?
Morgantao (author)  blkhawk4 years ago
The great majority of these batteries are Alkaline batteries, so they don't have anything too bad in them. A pair of gloves and safety goggles are enough.
Why, what did you have in mind?
Then by all means go ahead and share with us your projects.
+1
iceng4 years ago
I used to extract the carbon rods for experimental rectifiers.

A