CommentStreams:3465bf2fb4af3eac0cc77b1fa3214919

it seems if you short out power switch and dual power connected then it works the way ups does, soon as power is applied battery get charge and pi is up and running then power goes out pi continue running on battery until battery dies, add voltage divider for 5v input power to any GPIO pin to detect power outage. it works the way my needs.