What is main battery?

The main battery usually refers to the primary battery in an electronic device, such as a cellphone or laptop, that powers the device. The battery is typically rechargeable and can be charged through a charging cable or port. The life of the battery depends on the size of the battery, the efficiency of the device, and how it is used. Over time, the battery may degrade and lose its ability to hold a charge, requiring replacement. Some devices also have secondary batteries, known as backup batteries, that are typically used as a temporary power source in case of a primary battery failure.