diff --git a/core/java/com/android/internal/os/BatteryStatsHistory.java b/core/java/com/android/internal/os/BatteryStatsHistory.java
index 617519b1b540d..fdcb87ff5e3fc 100644
--- a/core/java/com/android/internal/os/BatteryStatsHistory.java
+++ b/core/java/com/android/internal/os/BatteryStatsHistory.java
@@ -1468,6 +1468,11 @@ public class BatteryStatsHistory {
         mHistoryLastLastWritten.setTo(mHistoryLastWritten);
         final boolean hasTags = mHistoryLastWritten.tagsFirstOccurrence || cur.tagsFirstOccurrence;
         mHistoryLastWritten.setTo(mHistoryBaseTimeMs + elapsedRealtimeMs, cmd, cur);
+        if (mHistoryLastWritten.time < mHistoryLastLastWritten.time - 60000) {
+            Slog.wtf(TAG, "Significantly earlier event written to battery history:"
+                    + " time=" + mHistoryLastWritten.time
+                    + " previous=" + mHistoryLastLastWritten.time);
+        }
         mHistoryLastWritten.tagsFirstOccurrence = hasTags;
         writeHistoryDelta(mHistoryBuffer, mHistoryLastWritten, mHistoryLastLastWritten);
         mLastHistoryElapsedRealtimeMs = elapsedRealtimeMs;
@@ -1908,12 +1913,6 @@ public class BatteryStatsHistory {
             in.setDataPosition(curPos + bufSize);
         }
 
-        if (DEBUG) {
-            StringBuilder sb = new StringBuilder(128);
-            sb.append("****************** OLD mHistoryBaseTimeMs: ");
-            TimeUtils.formatDuration(mHistoryBaseTimeMs, sb);
-            Slog.i(TAG, sb.toString());
-        }
         mHistoryBaseTimeMs = historyBaseTime;
         if (DEBUG) {
             StringBuilder sb = new StringBuilder(128);
@@ -1922,11 +1921,10 @@ public class BatteryStatsHistory {
             Slog.i(TAG, sb.toString());
         }
 
-        // We are just arbitrarily going to insert 1 minute from the sample of
-        // the last run until samples in this run.
         if (mHistoryBaseTimeMs > 0) {
-            long oldnow = mClock.elapsedRealtime();
-            mHistoryBaseTimeMs = mHistoryBaseTimeMs - oldnow + 1;
+            long elapsedRealtimeMs = mClock.elapsedRealtime();
+            mLastHistoryElapsedRealtimeMs = elapsedRealtimeMs;
+            mHistoryBaseTimeMs = mHistoryBaseTimeMs - elapsedRealtimeMs + 1;
             if (DEBUG) {
                 StringBuilder sb = new StringBuilder(128);
                 sb.append("****************** ADJUSTED mHistoryBaseTimeMs: ");
diff --git a/services/core/java/com/android/server/am/ActivityManagerService.java b/services/core/java/com/android/server/am/ActivityManagerService.java
index a888a0b5d7d9b..8ce1829a4b16d 100644
--- a/services/core/java/com/android/server/am/ActivityManagerService.java
+++ b/services/core/java/com/android/server/am/ActivityManagerService.java
@@ -2497,13 +2497,10 @@ public class ActivityManagerService extends IActivityManager.Stub
         final File systemDir = SystemServiceManager.ensureSystemDir();
 
         // TODO: Move creation of battery stats service outside of activity manager service.
-        mBatteryStatsService = new BatteryStatsService(systemContext, systemDir,
-                BackgroundThread.get().getHandler());
-        mBatteryStatsService.getActiveStatistics().readLocked();
-        mBatteryStatsService.scheduleWriteToDisk();
+        mBatteryStatsService = BatteryStatsService.create(systemContext, systemDir,
+                BackgroundThread.getHandler(), this);
         mOnBattery = DEBUG_POWER ? true
                 : mBatteryStatsService.getActiveStatistics().getIsOnBattery();
-        mBatteryStatsService.getActiveStatistics().setCallback(this);
         mOomAdjProfiler.batteryPowerChanged(mOnBattery);
 
         mProcessStats = new ProcessStatsService(this, new File(systemDir, "procstats"));
diff --git a/services/core/java/com/android/server/am/BatteryStatsService.java b/services/core/java/com/android/server/am/BatteryStatsService.java
index 6360e2a0d0890..36da888dbc2a7 100644
--- a/services/core/java/com/android/server/am/BatteryStatsService.java
+++ b/services/core/java/com/android/server/am/BatteryStatsService.java
@@ -399,6 +399,20 @@ public final class BatteryStatsService extends IBatteryStats.Stub
         mCpuWakeupStats = new CpuWakeupStats(context, R.xml.irq_device_map, mHandler);
     }
 
+    /**
+     * Creates an instance of BatteryStatsService and restores data from stored state.
+     */
+    public static BatteryStatsService create(Context context, File systemDir, Handler handler,
+            BatteryStatsImpl.BatteryCallback callback) {
+        BatteryStatsService service = new BatteryStatsService(context, systemDir, handler);
+        service.mStats.setCallback(callback);
+        synchronized (service.mStats) {
+            service.mStats.readLocked();
+        }
+        service.scheduleWriteToDisk();
+        return service;
+    }
+
     public void publish() {
         LocalServices.addService(BatteryStatsInternal.class, new LocalService());
         ServiceManager.addService(BatteryStats.SERVICE_NAME, asBinder());