We are in the process of UL-certifying it with the cells that we ship it with, then if you replace the cells, I guess the certification is not valid anymore, bu

We are in the process of UL-certifying it with the cells that we ship it with, then if you replace the cells, I guess the certification is not valid anymore, but if you choose good quality cells you should be quite reassured to know that the whole battery (except your new cells) has been certified, and that the casing is fireproof!