Especially the older ones!
I have opened about 10 so far and 2 were old ones and one of them was a thick copper coating and in the other was a thick brass coating.
Just take a hammer to one and it comes apart like nothing.
Brass from one weighted a bit more than 1kg so around here that would fetch me £2.40 ($3.84) per charger.
1kg of brass from one -
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