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> there is no 'battery safety box' that I could readilly buy

Take a look at Bat-Safe LiPo boxes. They are designed to contain the heat and prevent your entire house from going up from a drone battery fire.

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Bought one of these a while ago, super happy with the peace of mind these things provide. (I am using it mostly for drone batteries). I hope I'll never have to find out how well it actually works first hand though.

okay, their largest box is actually big enough to deal with am ebike battery, this could work!

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