USB camera modules usually do not require a battery. This is because the USB camera module is connected to a computer or other device through the USB interface, and they get the power they need through the USB cable. The USB interface provides a stable power supply, enough to support the normal operation of the camera module.
Specifically, when the USB camera module is connected to a computer, the computer provides power to the camera through the USB interface. This type of power supply is convenient and reliable without the need for additional batteries or power adapters.
Therefore, I de fleste tilfælde, users do not need to install a battery for the USB camera module. Imidlertid, there are special USB cameras, such as portable or wireless cameras, which may have built-in batteries to support working in environments without a power outlet. Imidlertid, this type of camera is not a mainstream USB camera module, and it requires regular charging when in use.
To sum up, for most USB camera modules, they do not need to install a battery, but directly through the USB interface to obtain power supply.