Lithium batteries.
Lithium batteries are batteries manufactured using lithium metal or lithium alloy as positive and negative electrode materials and using non-electrolyte solutions. There are many types of lithium batteries, the most common being lithium-ion batteries.
The self-discharge capacity of lithium batteries is much smaller than that of other batteries. At a temperature of 20 degrees, they can be stored for more than half a year and the power is relatively stable. But this is also affected by temperature. During the northern winter, power outages may occur outdoors. As long as the lithium-ion battery is brought back to a temperature of around 20 degrees, it will resume normal operation.