diff --git a/platform/features/timeline/bundle.js b/platform/features/timeline/bundle.js
index 145a496f08..42b3c948f9 100644
--- a/platform/features/timeline/bundle.js
+++ b/platform/features/timeline/bundle.js
@@ -184,14 +184,14 @@ define([
                             "pattern": "^-?\\d+(\\.\\d*)?$"
                         },
                         {
-                            "name": "Battery Starting SOC",
+                            "name": "Battery starting SOC (%)",
                             "control": "textfield",
                             "required": false,
                             "conversion": "number",
                             "property": [
                                 "startingSOC"
                             ],
-                            "pattern": "^-?\\d+(\\.\\d*)?$"
+                            "pattern": "^([0-9](\\.\\d*)?|[1-9][0-9](\\.\\d*)?|100)%?$"
                         }
                     ],
                     "model": {
diff --git a/platform/features/timeline/src/capabilities/GraphCapability.js b/platform/features/timeline/src/capabilities/GraphCapability.js
index c4e5166f0e..86095b13ab 100644
--- a/platform/features/timeline/src/capabilities/GraphCapability.js
+++ b/platform/features/timeline/src/capabilities/GraphCapability.js
@@ -55,12 +55,14 @@ define(
                 if (domainObject.getModel().type === 'timeline' &&
                         result.power &&
                             domainObject.getModel().capacity > 0) {
+                    domainObject.getModel().startingSOC =
+                        parseFloat(domainObject.getModel().startingSOC) || 100;
 
                     result.battery = new CumulativeGraph(
                         result.power,
                         0,
                         domainObject.getModel().capacity, // Watts
-                        domainObject.getModel().startingSOC,
+                        (domainObject.getModel().startingSOC/100)*domainObject.getModel().capacity,
                         1 / 3600000 // millis-to-hour (since units are watt-hours)
                     );
                 }