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, in most cases, users do not need to install a battery for the USB camera module. However, 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. However, 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.