Solar Floodlight Battery Levels

I have had a Solar Floodlight installed for about a month. I just added a 2nd battery to it. I’d like to know how the battery charge levels are calculated, as the percentages are not shown “per battery” (as with the solar battery spotlight cam), rather there is only a single percentage showing. After operating for 8+ hours overnight, the battery level still shows 100%, which cannot be possible. Does anyone know if there is a way to see each of the 2 batteries current charge state, or how the battery level percentages are calculated when 2 batteries are installed?