How to make a battery 12v 45A from battery of laptops dead, or damaged.

In this tutorial i will show you How to make a battery 12v 45A from battery of laptops dead, or damaged.
So first we have use all the bateries of laptops who not working or they are damaged.
All of times happends one ore two off cells can be damaged and battery not work, but we can use they who are good.
And one cells have from 3.7v to 4V
And one cells 3000mAh have ore 3Amp.
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Thanks.