changed isBatteryLow function to check voltage

instead of percent

lib/Battery/battery.cpp

@@ -45,8 +45,8 @@ double Battery::getBatteryVoltage() {
     return (int)(res*100+0.5)/100.0;
 }
 
-bool Battery::isBatteryLow(uint8_t percent) {
-    if (this->getBatteryPercent() <= percent && this->batteryVoltage > this->absurdLowVoltage)
+bool Battery::isBatteryLow(double voltage) {
+    if (this->getBatteryVoltage() <= voltage && this->batteryVoltage > this->absurdLowVoltage)
         return true;
     return false;
 }

lib/Battery/battery.h

@@ -83,11 +83,11 @@ class Battery {
          * absurd low. This is for the case that the uController is powered
          * by usb and no battery is connected.
          * 
-         * @param percent the limit the battery have to
+         * @param voltage the limit the battery have to
          * @return true if the battery is low
          * @return false if the battery is high
          */
-        bool isBatteryLow(uint8_t percent);
+        bool isBatteryLow(double voltage);
 
     private:
         double calculateInputVoltage();