diff --git a/core/java/com/android/internal/os/BatteryStatsImpl.java b/core/java/com/android/internal/os/BatteryStatsImpl.java
index 6829f3d..98d4c59 100644
--- a/core/java/com/android/internal/os/BatteryStatsImpl.java
+++ b/core/java/com/android/internal/os/BatteryStatsImpl.java
@@ -4503,10 +4503,13 @@
             for (Map.Entry<HistoryTag, Integer> entry: mHistoryTagPool.entrySet()) {
                 entry.setValue(entry.getValue() | TAG_FIRST_OCCURRENCE_FLAG);
             }
+            // Make a copy of mHistoryCur.
+            HistoryItem copy = new HistoryItem();
+            copy.setTo(cur);
+            // startRecordingHistory will reset mHistoryCur.
             startRecordingHistory(elapsedRealtimeMs, uptimeMs, false);
-            HistoryItem newItem = new HistoryItem();
-            newItem.setTo(cur);
-            addHistoryBufferLocked(elapsedRealtimeMs, HistoryItem.CMD_UPDATE, newItem);
+            // Add the copy into history buffer.
+            addHistoryBufferLocked(elapsedRealtimeMs, HistoryItem.CMD_UPDATE, copy);
             return;
         }
 
diff --git a/core/tests/coretests/src/com/android/internal/os/BatteryStatsHistoryIteratorTest.java b/core/tests/coretests/src/com/android/internal/os/BatteryStatsHistoryIteratorTest.java
index 3858792..dd0e9ff 100644
--- a/core/tests/coretests/src/com/android/internal/os/BatteryStatsHistoryIteratorTest.java
+++ b/core/tests/coretests/src/com/android/internal/os/BatteryStatsHistoryIteratorTest.java
@@ -154,19 +154,21 @@
 
         for (int i = 0; i < eventCount; i++) {
             String name = "a" + (i % 10);
-            assertThat(iterator.next(item)).isTrue();
-            // Skip a blank event inserted at the start of every buffer
-            if (item.eventCode == BatteryStats.HistoryItem.EVENT_NONE) {
+            do {
                 assertThat(iterator.next(item)).isTrue();
-            }
+                // Skip a blank event inserted at the start of every buffer
+            } while (item.cmd != BatteryStats.HistoryItem.CMD_UPDATE
+                    || item.eventCode == BatteryStats.HistoryItem.EVENT_NONE);
+
             assertThat(item.eventCode).isEqualTo(BatteryStats.HistoryItem.EVENT_ALARM
                     | BatteryStats.HistoryItem.EVENT_FLAG_START);
             assertThat(item.eventTag.string).isEqualTo(name);
 
-            assertThat(iterator.next(item)).isTrue();
-            if (item.eventCode == BatteryStats.HistoryItem.EVENT_NONE) {
+            do {
                 assertThat(iterator.next(item)).isTrue();
-            }
+            } while (item.cmd != BatteryStats.HistoryItem.CMD_UPDATE
+                    || item.eventCode == BatteryStats.HistoryItem.EVENT_NONE);
+
             assertThat(item.eventCode).isEqualTo(BatteryStats.HistoryItem.EVENT_ALARM
                     | BatteryStats.HistoryItem.EVENT_FLAG_FINISH);
             assertThat(item.eventTag.string).isEqualTo(name);