I could not find the reason for the large current consumption in the off mode. The owner of the thermal imager said that this problem was from the very beginning after the purchase. I solved the problem by putting a reed switch. A permanently closed reed switch is included in the battery circuit. During long-term storage, the magnet fixed in the slider acts on the reed switch. The power turns off. Reed switch is used so as not to violate the tightness of the thermal imager.