diff --git a/src/FirmwarePlugin/PX4/PX4ParameterFactMetaData.xml b/src/FirmwarePlugin/PX4/PX4ParameterFactMetaData.xml
index 30dc880360da227159040bc3d6bd54d156d3979b..0e218908fee6e486bce100132558a68ad19619e4 100644
--- a/src/FirmwarePlugin/PX4/PX4ParameterFactMetaData.xml
+++ b/src/FirmwarePlugin/PX4/PX4ParameterFactMetaData.xml
@@ -423,6 +423,7 @@ Set to 2 to use heading from motion capture</short_desc>
       <long_desc>This parameter controls the source of battery data. The value 'Power Module' means that measurements are expected to come from a power module. If the value is set to 'External' then the system expects to receive mavlink battery status messages. If the value is set to 'ESCs', the battery information are taken from the esc_status message. This requires the ESC to provide both voltage as well as current.</long_desc>
       <reboot_required>True</reboot_required>
       <values>
+        <value code="-1">Disabled</value>
         <value code="0">Power Module</value>
         <value code="1">External</value>
         <value code="2">ESCs</value>
@@ -518,11 +519,12 @@ Set to 2 to use heading from motion capture</short_desc>
       <increment>0.01</increment>
       <reboot_required>True</reboot_required>
     </parameter>
-    <parameter name="BAT2_SOURCE" default="0" type="INT32">
+    <parameter name="BAT2_SOURCE" default="-1" type="INT32">
       <short_desc>Battery 2 monitoring source</short_desc>
       <long_desc>This parameter controls the source of battery data. The value 'Power Module' means that measurements are expected to come from a power module. If the value is set to 'External' then the system expects to receive mavlink battery status messages. If the value is set to 'ESCs', the battery information are taken from the esc_status message. This requires the ESC to provide both voltage as well as current.</long_desc>
       <reboot_required>True</reboot_required>
       <values>
+        <value code="-1">Disabled</value>
         <value code="0">Power Module</value>
         <value code="1">External</value>
         <value code="2">ESCs</value>