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Also, is housing LiPo batteries in an old ASDA plastic food box a good thing to do cushioned in with packing foam or is it a relatively sketchy thing to do?
I would think it was OK, it is what I've done with my LiFePO4 batteries (though I am open to being wrong here if that isn't a thing to do). I've screwed down the battery box to the chassis board and then screwed the lid to the box, lining the box with material on the base and the lid and having the same material supporting the box on the overhang from the screws.