diff --git a/src/PowerFSM.cpp b/src/PowerFSM.cpp
index e4cf8fae..39299219 100644
--- a/src/PowerFSM.cpp
+++ b/src/PowerFSM.cpp
@@ -37,6 +37,14 @@ static void sdsEnter()
     doDeepSleep(getPref_sds_secs() * 1000LL);
 }
 
+extern Power *power;
+
+static void shutdownEnter()
+{
+    DEBUG_MSG("Enter state: SHUTDOWN\n");
+    power->shutdown();
+}
+
 #include "error.h"
 
 static uint32_t secsSlept;
@@ -217,6 +225,7 @@ static void bootEnter() {
     DEBUG_MSG("Enter state: BOOT\n");
 }
 
+State stateSHUTDOWN(shutdownEnter, NULL, NULL, "SHUTDOWN");
 State stateSDS(sdsEnter, NULL, NULL, "SDS");
 State stateLS(lsEnter, lsIdle, lsExit, "LS");
 State stateNB(nbEnter, NULL, NULL, "NB");
@@ -260,6 +269,14 @@ void PowerFSM_setup()
     powerFSM.add_transition(&stateON, &stateSDS, EVENT_LOW_BATTERY, NULL, "LowBat");
     powerFSM.add_transition(&stateSERIAL, &stateSDS, EVENT_LOW_BATTERY, NULL, "LowBat");
 
+    // Handle being told to power off
+    powerFSM.add_transition(&stateBOOT, &stateSHUTDOWN, EVENT_SHUTDOWN, NULL, "Shutdown");
+    powerFSM.add_transition(&stateLS, &stateSHUTDOWN, EVENT_SHUTDOWN, NULL, "Shutdown");
+    powerFSM.add_transition(&stateNB, &stateSHUTDOWN, EVENT_SHUTDOWN, NULL, "Shutdown");
+    powerFSM.add_transition(&stateDARK, &stateSHUTDOWN, EVENT_SHUTDOWN, NULL, "Shutdown");
+    powerFSM.add_transition(&stateON, &stateSHUTDOWN, EVENT_SHUTDOWN, NULL, "Shutdown");
+    powerFSM.add_transition(&stateSERIAL, &stateSHUTDOWN, EVENT_SHUTDOWN, NULL, "Shutdown");
+
     powerFSM.add_transition(&stateDARK, &stateON, EVENT_BLUETOOTH_PAIR, NULL, "Bluetooth pairing");
     powerFSM.add_transition(&stateON, &stateON, EVENT_BLUETOOTH_PAIR, NULL, "Bluetooth pairing");
 
diff --git a/src/PowerFSM.h b/src/PowerFSM.h
index 5541385a..2515534b 100644
--- a/src/PowerFSM.h
+++ b/src/PowerFSM.h
@@ -19,6 +19,7 @@
 #define EVENT_POWER_CONNECTED 13
 #define EVENT_POWER_DISCONNECTED 14
 #define EVENT_FIRMWARE_UPDATE 15 // We just received a new firmware update packet from the phone
+#define EVENT_SHUTDOWN 16 //force a full shutdown now (not just sleep)
 
 extern Fsm powerFSM;
 extern State statePOWER, stateSERIAL;
diff --git a/src/main.cpp b/src/main.cpp
index 4429391d..eafd1956 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -134,6 +134,8 @@ static int32_t ledBlinker()
     return powerStatus->getIsCharging() ? 1000 : (ledOn ? 1 : 1000);
 }
 
+uint32_t timeLastPowered = 0;
+
 /// Wrapper to convert our powerFSM stuff into a 'thread'
 class PowerFSMThread : public OSThread
 {
@@ -151,6 +153,13 @@ class PowerFSMThread : public OSThread
         auto state = powerFSM.getState();
         canSleep = (state != &statePOWER) && (state != &stateSERIAL);
 
+        if (powerStatus->getHasUSB()) {
+            timeLastPowered = millis();
+        } else if (radioConfig.preferences.on_battery_shutdown_after_secs > 0 && 
+                    millis() > timeLastPowered + (1000 * radioConfig.preferences.on_battery_shutdown_after_secs)) { //shutdown after 30 minutes unpowered
+            powerFSM.trigger(EVENT_SHUTDOWN);
+        }
+        
         return 10;
     }
 };
diff --git a/src/mesh/generated/radioconfig.pb.h b/src/mesh/generated/radioconfig.pb.h
index 4cbb693b..ae13b867 100644
--- a/src/mesh/generated/radioconfig.pb.h
+++ b/src/mesh/generated/radioconfig.pb.h
@@ -151,6 +151,7 @@ typedef struct _RadioConfig_UserPreferences {
     uint32_t position_flags;
     bool is_always_powered;
     uint32_t auto_screen_carousel_secs;
+    uint32_t on_battery_shutdown_after_secs;
 } RadioConfig_UserPreferences;
 
 typedef struct _RadioConfig {
@@ -195,9 +196,9 @@ extern "C" {
 
 /* Initializer values for message structs */
 #define RadioConfig_init_default                 {false, RadioConfig_UserPreferences_init_default}
-#define RadioConfig_UserPreferences_init_default {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, "", "", 0, _RegionCode_MIN, _ChargeCurrent_MIN, 0, _LocationSharing_MIN, _GpsOperation_MIN, 0, 0, 0, 0, 0, 0, 0, "", 0, _GpsCoordinateFormat_MIN, 0, 0, 0, 0, 0, {0, 0, 0}, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, _RadioConfig_UserPreferences_EnvironmentalMeasurementSensorType_MIN, 0, 0, 0, 0, 0, 0}
+#define RadioConfig_UserPreferences_init_default {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, "", "", 0, _RegionCode_MIN, _ChargeCurrent_MIN, 0, _LocationSharing_MIN, _GpsOperation_MIN, 0, 0, 0, 0, 0, 0, 0, "", 0, _GpsCoordinateFormat_MIN, 0, 0, 0, 0, 0, {0, 0, 0}, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, _RadioConfig_UserPreferences_EnvironmentalMeasurementSensorType_MIN, 0, 0, 0, 0, 0, 0, 0}
 #define RadioConfig_init_zero                    {false, RadioConfig_UserPreferences_init_zero}
-#define RadioConfig_UserPreferences_init_zero    {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, "", "", 0, _RegionCode_MIN, _ChargeCurrent_MIN, 0, _LocationSharing_MIN, _GpsOperation_MIN, 0, 0, 0, 0, 0, 0, 0, "", 0, _GpsCoordinateFormat_MIN, 0, 0, 0, 0, 0, {0, 0, 0}, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, _RadioConfig_UserPreferences_EnvironmentalMeasurementSensorType_MIN, 0, 0, 0, 0, 0, 0}
+#define RadioConfig_UserPreferences_init_zero    {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, "", "", 0, _RegionCode_MIN, _ChargeCurrent_MIN, 0, _LocationSharing_MIN, _GpsOperation_MIN, 0, 0, 0, 0, 0, 0, 0, "", 0, _GpsCoordinateFormat_MIN, 0, 0, 0, 0, 0, {0, 0, 0}, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, _RadioConfig_UserPreferences_EnvironmentalMeasurementSensorType_MIN, 0, 0, 0, 0, 0, 0, 0}
 
 /* Field tags (for use in manual encoding/decoding) */
 #define RadioConfig_UserPreferences_position_broadcast_secs_tag 1
@@ -264,6 +265,7 @@ extern "C" {
 #define RadioConfig_UserPreferences_position_flags_tag 150
 #define RadioConfig_UserPreferences_is_always_powered_tag 151
 #define RadioConfig_UserPreferences_auto_screen_carousel_secs_tag 152
+#define RadioConfig_UserPreferences_on_battery_shutdown_after_secs_tag 153
 #define RadioConfig_preferences_tag              1
 
 /* Struct field encoding specification for nanopb */
@@ -337,7 +339,8 @@ X(a, STATIC,   SINGULAR, BOOL,     store_forward_plugin_enabled, 148) \
 X(a, STATIC,   SINGULAR, BOOL,     store_forward_plugin_heartbeat, 149) \
 X(a, STATIC,   SINGULAR, UINT32,   position_flags,  150) \
 X(a, STATIC,   SINGULAR, BOOL,     is_always_powered, 151) \
-X(a, STATIC,   SINGULAR, UINT32,   auto_screen_carousel_secs, 152)
+X(a, STATIC,   SINGULAR, UINT32,   auto_screen_carousel_secs, 152) \
+X(a, STATIC,   SINGULAR, UINT32,   on_battery_shutdown_after_secs, 153)
 #define RadioConfig_UserPreferences_CALLBACK NULL
 #define RadioConfig_UserPreferences_DEFAULT NULL
 
@@ -349,8 +352,8 @@ extern const pb_msgdesc_t RadioConfig_UserPreferences_msg;
 #define RadioConfig_UserPreferences_fields &RadioConfig_UserPreferences_msg
 
 /* Maximum encoded size of messages (where known) */
-#define RadioConfig_size                         444
-#define RadioConfig_UserPreferences_size         441
+#define RadioConfig_size                         451
+#define RadioConfig_UserPreferences_size         448
 
 #ifdef __cplusplus
 } /* extern "C" */