Ensure battery cell detection happens after everything has powered up.

Previously, on the OLIMEXINO at least, initial readings are lower than
normal readings and that meant that the battery warning voltage was
incorrectly set.

src/main/main.c

@@ -127,10 +127,6 @@ void init(void)
 
     adcInit(&adc_params);
 
-    // Check battery type/voltage
-    if (feature(FEATURE_VBAT))
-        batteryInit(&masterConfig.batteryConfig);
-
     initBoardAlignment(&masterConfig.boardAlignment);
 
     // We have these sensors; SENSORS_SET defined in board.h depending on hardware platform
@@ -242,6 +238,12 @@ void init(void)
     }
     serialPrint(loopbackPort, "LOOPBACK\r\n");
 #endif
+
+    // Now that everything has powered up the voltage and cell count be determined.
+
+    // Check battery type/voltage
+    if (feature(FEATURE_VBAT))
+        batteryInit(&masterConfig.batteryConfig);
 }
 
 #ifdef SOFTSERIAL_LOOPBACK

src/main/sensors/battery.c

@@ -83,7 +83,7 @@ void batteryInit(batteryConfig_t *initialBatteryConfig)
     }
 
     batteryCellCount = i;
-    batteryWarningVoltage = i * batteryConfig->vbatmincellvoltage; // 3.3V per cell minimum, configurable in CLI
+    batteryWarningVoltage = batteryCellCount * batteryConfig->vbatmincellvoltage; // 3.3V per cell minimum, configurable in CLI
 }
 
 #define ADCVREF 33L