Unfortunately, I don't have a Witty Py or a DFR0327 card on hand yet. Therefore, I can't check the battery option yet.If you look at the circuit board https://github.com/Arduinolibrary/DFRobot_Arduino_Expansion_Shield_for_Raspberry_Pi_B_plus/raw/master/Raspberry%20B%2B%20Meet%20Arduino.pdf , then in my opinion it is enough to unsolder the 8-th pin (+5V) of the U1 chip (DS1307). Or I can do something radical, and completely unsolder the entire U1 chip.I wanted to clarify in advance, maybe someone has already solved this problem.