PCF8563 does not remember time when restarting Arduino Uno? I'm trying to use the following RTC module (PCF8563) with Arduino Uno.

I am using this library to set/get time and date from PCF8563. However, whenever I shut down the Arduino, the time/date is lost! Even though, as you can see in the picture, the module is equipped with a 3V battery to keep running when Arduino is unplugged.

Any help would be highly appreciated!
[SOLVED]

The solution is simply to put a jumper between BAT and VCC positions in the module itself. Many thanks to Edgar Bonet