Hummie 18650 Battery PCB

That sounds like a robust approach.

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I wouldnā€™t sandwich this pcb with another pcb. I wouldnā€™t do any sandwiching of any type with this pcb. If u must at least do it with some iron cells as I expect it will short sandwiched.
I think this pcb really needs to be mounted held by the cells alone.

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I havenā€™t thought this through, but you donā€™t think you could just insulate the copper and lay another layer of cells on the other side?

If u had room to put cells on other side of the pcb maybe ā€¦think be hard to attach them though.
But then itā€™s a lot of strain on the nickel as u have cells on the other side and itā€™s all either bouncing around in a box and stressing nickel or one side is floating with the other side held and heavy cells held by nickel and tape and glue. Maybe itā€™s ok or maybe it will stress the nickel. If anyone asks Iā€™m saying just mount the battery by the cells alone with Velcro. Itā€™s a rough environment.

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How much do you want for one shipped to the U.K.?

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Sorry not shipping the battery by air. Can ship pcbs solo or with deck n mounted box

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Just want the pcb and nickelā€¦

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If u want it message me and can send. Parcel monkey or ups I hear is cheaper