Solar Floodlight Battery Level Indicates 0% When Fully Charged

I installed a Ring Solar Floodlight with a single fully-charged battery yesterday. I tested it out and everything seemed to be operating fine, EXCEPT the battery level under device health indicated a 0% charge. I know that’s not right, so this morning I repositioned the battery from the right slot to the left one on the off chance that would give me an accurate reading; it did not. Thinking maybe I had a bad battery, I replaced it with a brand new and fully charged battery, first in one slot and then in the other, but still got a 0% charged reading. As a final test, I added the second battery so that both slots were occupied with a fully charged battery, but the battery reading remains 0%.Can someone let me know if this is normal, or what the cause and fix might be? Thank you.