I built one large box to hold up to 4 batteries, but not 8D or 4D sized ones.
So all batteries sit together in the box. I only have 2 in there, plan to put a third one again this summer.
I coated the battery box with a rubber like coating. I have no top, the box sides reach to the battery tops and I have a board screwed down across the batteries to hold them in place. The box and top hold down board has been lasting great, I tried rope ties and webbing and it just was not as secure to hold batteries so they dont move. For spacing and so they can not slide, I cut some wood and they sit in the box bottom.
All batteries eventually fail and may spill some acid, so put a layer of baking soda in the box bottom and sit the batteries on that, or around that to neutralize any spills and preserve your box.
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