Battery Testing - Good or bad

I have a Ring Doorbell 2 gifted from a friend. I have fully charged the battery until only the "Green" light shown and "Red" light out. But after I plugged it in, there is no respond from the doorbell. Not sure if the device itself is bad or if the battery is bad. The Model is Ring "Video Doorbell 2", the battery Model is V4. Noticed that there are 5 outlets (+ C+ D C -), using Volt-meter I measured the voltages on the battery outlets as following: between - and +: 4.05V between - and C+: 0V between - and D: 0V between - and C: 0V between + and C+: 0.17V What are the 5 outlets should have in voltage? is the battery no good, or is the Ring device may be broken?