Battery seems like original from Ring. Quality product. The original battery lasted less than 2 months only. So it's good to have a fully charged spare one to replace the drained out one.
However, if I knew there is the Solar Battery Charger, which is more expensive of course, then I might not buy it. After all, who likes to screw in and out every couple of months just to replace the batteries!!!
Anyway, it's a good product. Installed on Jan 8, will check how long it can last.