beginner from ARDUINO
my device is arduino nano, sim900a gsm,and neo gps. Is it normal for such device to deplete 9V battery this quick?
Where "this quick" is what? Only a year? Only 2 minutes? Give us a hint.
But if you are talking about one of those rectangular PP3 9V batteries used in smoke detectors then it won't last for long. GSM modules in particular tend to use quite a lot of power.
Steve