Abstract: The disclosure is to provide a battery pack apparatus including in one form a multi-channel network charging apparatus and a multi-channel battery power supply module. A battery pack apparatus using sunlight and commercial electricity, and comprising a solar cell panel, a charging apparatus, a monitoring unit, and a battery power supply module, can perform quick charging using a multi-channel network method when charging a charging battery of a multi-channel battery power supply module with electricity generated from collected sunlight and commercial electricity, enables easy replacement of a charging battery as charging batteries of the multi-channel battery power supply module are mounted in a configuration enabling the independent respective detachment thereof, wherein one network control board is inserted in each of the four charging batteries in order to control the four charging batteries and to detect the input voltages, input currents, output voltages, and output currents thereof.