I found just fit size of a box for containing two lead batteries at a one-coin shop. I troubled to carry the two lead batteries from my room to garage. I was looking for just a box. I show you photos of the box. The size of inside dimension is 110x125xH125 [mm] ( 4.3x4.9xH4.9" ). I attached a protection diode bridge not to damage external power supply. I use 2 diodes in a full bridge, so endurance is 6A in double. The bridge is attached in the metal front plate by a screw considering heat transfer. And I attached my designed plug heater below the terminal.
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