How should the four LED should light up (on)

Hi, excuse me. I'm finally trying out my UPS3 but seems to not turning on the 4 main lights (which is supposed to be for Battery percentage). Also, is there any way to display my battery percentage on my taskbar from Raspberry Pi OS?

Thanks. Otherwise, after installation, it says it is not charging (to charging it, do I must to connect my supply cable to the UPS module right?)