--- a/src/energy/model/li-ion-energy-source.h	Fri Sep 05 15:38:55 2014 -0700
+++ b/src/energy/model/li-ion-energy-source.h	Fri Sep 05 16:33:57 2014 -0700
@@ -185,6 +185,7 @@
   TracedValue<double> m_remainingEnergyJ; // remaining energy, in Joules
   double m_drainedCapacity;               // capacity drained from the cell, in Ah
   double m_supplyVoltageV;                // actual voltage of the cell
+  double m_lowBatteryTh;                  // low battery threshold, as a fraction of the initial energy
   EventId m_energyUpdateEvent;            // energy update event
   Time m_lastUpdateTime;                  // last update time
   Time m_energyUpdateInterval;            // energy update interval