Solar Panel Connectivity > Spotlight Cam Plus Battery,

Hi I bought my parents 2 Spotlight Cam Plus Battery, (from Amazon as they were out of stock on the Ring site) and 2 Solar Panels (barrel connector). Looking at the back of the cameras though ,there is no socket into which the solar panel lead plugs in, USB/Barrel or otherwise.I have two cameras myself, both of which were bought without Solar panels, but which I subsequently added the solar panels with no issue, so I assumed I could do the same again.Has anyone experienced similar, or are able to provide any advice?ThanksMatt