[FIX] battery have a default voltage when off and plug in the rps function

Author: maxoum-shi7su

elio.py

@@ -48,6 +48,8 @@ def repetition_per_second(self):
             float: The number of repetitions per second.
         """
         vBatt = self.get_battery_voltage()
+        if vBatt < 2:
+            vBatt = 2
         rpm = 20.3 * vBatt
         rps = rpm / 60
         return rps