Lithium batteries are usually placed in semi-sealed stainless steel boxes. Of course, insulation and sealing must be done well. Semi-sealed means it cannot be sealed. Why is the battery also completely sealed? must dissipate heat, unless you like it. When driving in a pool with half the water covering the car, it is necessary to make it completely waterproof. If it's just for normal protection from rain or dust, make a fully welded stainless steel. steel box, and the cover can be fixed normally. There is no need to apply glue or anything. Yes, the battery is well insulated and the box is waterproof. My battery is packaged normally and the charger is used normally. I don't want to integrate the charger into the box, because the charger generates heat when working. He ispowerful enough, just put it outside and use it. I kept the box in the car for six months and removed the hand balance battery. There was no dust, it was very clean and there was no water in it.
Don't use 18650, use another one. The case must be slotted according to the position of the card. The battery holder is at the bottom and the card is placed at the top. Leave about a centimeter of space above the board before placing the speaker. If possible, drill holes in the cabinet corresponding to the position of the speaker or replace it directly with that of the speaker. Planting barbed wire or fabric