Header: fix voltage scale (#714)

* Header: fix voltage scale

- fix Header voltage scale for 4.0.0 and later
- resolves: #679

* Update js/header_dialog.js

Co-authored-by: Mark Haslinghuis <[email protected]>

---------

Co-authored-by: Mark Haslinghuis <[email protected]>

Author: nerdCopter

js/header_dialog.js

@@ -602,9 +602,15 @@ function HeaderDialog(dialog, onSave) {
         setParameter('rcYawExpo'                ,sysConfig.rc_expo[2],2);
         setParameter('vbatscale'				,sysConfig.vbatscale,0);
         setParameter('vbatref'					,sysConfig.vbatref,0);
-        setParameter('vbatmincellvoltage'		,sysConfig.vbatmincellvoltage,1);
-        setParameter('vbatmaxcellvoltage'		,sysConfig.vbatmaxcellvoltage,1);
-        setParameter('vbatwarningcellvoltage'	,sysConfig.vbatwarningcellvoltage,1);
+        if (activeSysConfig.firmwareType === FIRMWARE_TYPE_BETAFLIGHT && semver.gte(activeSysConfig.firmwareVersion, '4.0.0')) {
+            setParameter('vbatmincellvoltage'       ,sysConfig.vbatmincellvoltage,2);
+            setParameter('vbatmaxcellvoltage'       ,sysConfig.vbatmaxcellvoltage,2);
+            setParameter('vbatwarningcellvoltage'   ,sysConfig.vbatwarningcellvoltage,2);
+        } else {
+            setParameter('vbatmincellvoltage'       ,sysConfig.vbatmincellvoltage,1);
+            setParameter('vbatmaxcellvoltage'       ,sysConfig.vbatmaxcellvoltage,1);
+            setParameter('vbatwarningcellvoltage'   ,sysConfig.vbatwarningcellvoltage,1);
+        }
         setParameter('minthrottle'				,sysConfig.minthrottle,0);
         setParameter('maxthrottle'				,sysConfig.maxthrottle,0);
         setParameter('currentMeterOffset'		,sysConfig.currentMeterOffset,0);