For no city power areas, the battery pack can be charged by solar panels and used for night lighting;
For the areas that city power is expensive, the battery pack can be charged during the electricity valley value
period, and used at the peak power period.
For the areas which power off from time to time, the battery pack can be used as UPS, to avoid information
loss caused by sudden power outage.
Battery pack is applicable to commercial lighting, industrial lighting, home lighting, outdoor lighting, camping
tourism, farming, planting, the night market stalls, etc.