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Then I unwraped the metal cover. Underneath it was a green membrane. After unwrapping the green membrane, I found a roll of thin metal membranes.
![](http://bp2.blogger.com/_1k_kxMAH7Aw/SEGQKuFRWxI/AAAAAAAAAbE/rHgq7C92tUo/s400/100_1242.jpg)
One of them was probably copper and the other I think was lithium. The were separated by a thin plastic membrane. These are the three layers.
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