--- a/bmsd/bms.h	Sat Dec 14 21:04:47 2019 +0100
+++ b/bmsd/bms.h	Sun Dec 15 15:08:09 2019 +0100
@@ -58,7 +58,7 @@
 
 
 #define MQTT_NODE_CONTROL	0x0001			///< Show node control
-
+#define LOWBATT			3.3			///< Low battery voltage
 
 
 /**
@@ -152,6 +152,7 @@
 {
     ALARM_FLAG_DOOR	= 0x0001,	///< Door open
     ALARM_FLAG_PSU	= 0x0002,	///< PSU problem
+    ALARM_FLAG_BATTERY	= 0x0004,	///< Low battery
     ALARM_FLAG_CHILLER	= 0x0100,	///< Chiller too warm
 } ALARM_FLAGS;