diff --git a/src/modules/mavlink/mavlink_messages.cpp b/src/modules/mavlink/mavlink_messages.cpp
index a95517d1b368..4276ed17fff2 100644
--- a/src/modules/mavlink/mavlink_messages.cpp
+++ b/src/modules/mavlink/mavlink_messages.cpp
@@ -598,8 +598,13 @@ class MavlinkStreamSysStatus : public MavlinkStream
 
 			int lowest_battery_index = 0;
 
+			//No battery is connected, select the first group
+			//Low battery judgment is performed only when the current battery is connected
+			//When the last cached battery is not connected or the current battery level is lower than the cached battery level,
+			//the current battery status is replaced with the cached value
 			for (int i = 0; i < ORB_MULTI_MAX_INSTANCES; i++) {
-				if (battery_status[i].connected && (battery_status[i].remaining < battery_status[lowest_battery_index].remaining)) {
+				if (battery_status[i].connected && ((!battery_status[lowest_battery_index].connected)
+								    || (battery_status[i].remaining < battery_status[lowest_battery_index].remaining))) {
 					lowest_battery_index = i;
 				}
 			}