diff --git a/libraries/AP_BattMonitor/AP_BattMonitor.h b/libraries/AP_BattMonitor/AP_BattMonitor.h
index 0b55e2846dd91..cfe8ab72988f8 100644
--- a/libraries/AP_BattMonitor/AP_BattMonitor.h
+++ b/libraries/AP_BattMonitor/AP_BattMonitor.h
@@ -13,7 +13,7 @@
 
 // maximum number of battery monitors
 #ifndef AP_BATT_MONITOR_MAX_INSTANCES
-#define AP_BATT_MONITOR_MAX_INSTANCES       9
+#define AP_BATT_MONITOR_MAX_INSTANCES       16
 #endif
 
 // first monitor is always the primary monitor