What is a battery pack and what is the difference from a battery?

The battery generally refers to a single battery, and multiple batteries pass through the string. The power supply composed in parallel is called battery pack.
The battery pack is divided into series and parallel. The parallel battery pack requires the same voltage of each battery, and the output voltage is equal to the voltage of one battery. The parallel battery pack can provide stronger current. There are no too many requirements for series battery packs, as long as the capacity of the battery is about the same. The series battery pack can provide higher voltage.