How can I stop this or why is it soon this
Carbon dioxide , CO2 is used to put out fires by stopping the oxygen. Baking soda can be used to create the CO2 What type of fire? chemical? electrical? Stopping the oxygen, cooling the fire or removing the fuel will put out a fire. Be careful, even fire extinguishers do not put out fires that are very large. They work for only a short time. Water is only used on paper/wood type fires. It will spread an oil fire and conduct with an electrical fire. What is the situation where there are no water mains or fire extinguishers?
why in the world would you want to do something like that? It's not an easy process, as a battery is not really meant for someone to just try and pry it apart.
Any clean white backdrop would do - white card is fine - curve it round for a 'seamless' look. Tbh, with macro photography, the depth of field is so shallow that the background is going to be out of focus anyway. White tissue paper, greaseproof or tracing paper is fine for the sides - basically you want something opaque enough that the flash head is not seen as a defined light source (the 'window' of diffuser material effectively becomes the light source, which is thus bigger softer) and which has no colour cast.
