Merge "Get battery presence at setup, if possible."

        synchronized (mLock) {

            registerListeners();

            mCurrentBatteryLevel = getCurrentBatteryLevel();

            // Get the current battery presence, if available. This would succeed if TARE is

            // toggled long after boot.

            final Intent batteryStatus = getContext().registerReceiver(null,

                    new IntentFilter(Intent.ACTION_BATTERY_CHANGED));

            if (batteryStatus != null) {

                final boolean hasBattery =

                        batteryStatus.getBooleanExtra(BatteryManager.EXTRA_PRESENT, true);

                if (mHasBattery != hasBattery) {

                    mHasBattery = hasBattery;

                    mConfigObserver.updateEnabledStatus();

                }

            }

        }

    }