diff --git a/app/src/main/java/com/example/medilightv2android/ble/BleManager.kt b/app/src/main/java/com/example/medilightv2android/ble/BleManager.kt
index c4a2d7c..c26ebfd 100644
--- a/app/src/main/java/com/example/medilightv2android/ble/BleManager.kt
+++ b/app/src/main/java/com/example/medilightv2android/ble/BleManager.kt
@@ -586,10 +586,10 @@ class BleManager private constructor(private val context: Context) {
      * 6채널 측정 명령(maa) 송신 가능 여부:
      *  (A) 이전 응답이 아직 진행 중(isMultiChannel && !isComplete)이면 차단.
      *      단 3초 넘게 응답이 안 오면 강제 통과(영영 deadlock 방지).
-     *  (B) 마지막 송신으로부터 600ms 미만이면 차단(펌웨어 burst 방어).
+     *  (B) 마지막 송신으로부터 500ms 미만이면 차단(펌웨어 burst 방어).
      *
      * FW VBTFW0116 + MTU 247 + CONN_PRIORITY HIGH 조합에서 한 사이클 응답이
-     * 약 280~420ms이므로, 600ms = 응답 평균 + 안전 마진 ~200ms.
+     * 약 280~420ms이므로, 500ms = 응답 평균 + 안전 마진 ~80~220ms.
      */
     private var lastMaaSentMs = 0L
     private fun canSendMaa(caller: String): Boolean {
@@ -603,7 +603,7 @@ class BleManager private constructor(private val context: Context) {
             }
             android.util.Log.w("BleManager", "maa FORCE [$caller] — prev incomplete after ${sinceLast}ms, abandoning")
         }
-        if (sinceLast < 600) {
+        if (sinceLast < 500) {
             android.util.Log.w("BleManager", "maa THROTTLED [$caller] — ${sinceLast}ms since last")
             return false
         }
diff --git a/app/src/main/java/com/example/medilightv2android/models/PiezoSettings.kt b/app/src/main/java/com/example/medilightv2android/models/PiezoSettings.kt
index 5a46da7..af13036 100644
--- a/app/src/main/java/com/example/medilightv2android/models/PiezoSettings.kt
+++ b/app/src/main/java/com/example/medilightv2android/models/PiezoSettings.kt
@@ -18,6 +18,6 @@ data class PiezoSettings(
     // Charles 833c110: BV calculation tweak — anterior-wall pull-in magnitude in millimetres.
     var antOffsetMm: Int = 0,
     // 우리 4ae25d9: Auto Scan 측정 사이클 목표 간격 (ms).
-    // BleManager.canSendMaa() time gate와 동일 값이 기본. 600ms 미만은 throttle이 막음.
-    var autoScanIntervalMs: Int = 600
+    // BleManager.canSendMaa() time gate와 동일 값이 기본 (500ms).
+    var autoScanIntervalMs: Int = 500
 )
diff --git a/app/src/main/java/com/example/medilightv2android/ui/views/monitoring/PiezoMonitoringView.kt b/app/src/main/java/com/example/medilightv2android/ui/views/monitoring/PiezoMonitoringView.kt
index 192412e..8e9ed12 100644
--- a/app/src/main/java/com/example/medilightv2android/ui/views/monitoring/PiezoMonitoringView.kt
+++ b/app/src/main/java/com/example/medilightv2android/ui/views/monitoring/PiezoMonitoringView.kt
@@ -862,32 +862,47 @@ fun PiezoMonitoringView(appState: AppState) {
             }
             Spacer(modifier = Modifier.weight(1f))
 
-            // Battery with icon
+            // Battery with icon — 연결 끊기면 disconnect 표시로 전환
             if (!isDemoMode) {
-                val batteryColor = when {
-                    batteryLvl >= 60 -> Color(0xFF4CAF50)
-                    batteryLvl >= 30 -> Color(0xFFFF9800)
-                    else -> Color.Red
-                }
-                Row(verticalAlignment = Alignment.CenterVertically) {
-                    // 배터리 바 아이콘 (Canvas로 직접 그리기)
-                    Canvas(modifier = Modifier.size(width = 22.dp, height = 12.dp)) {
-                        val w = size.width; val h = size.height
-                        // 외곽
-                        drawRoundRect(Color.Gray, topLeft = Offset(0f, 0f),
-                            size = Size(w * 0.88f, h), cornerRadius = androidx.compose.ui.geometry.CornerRadius(3f),
-                            style = Stroke(width = 1.5f))
-                        // 양극 돌출
-                        drawRect(Color.Gray, topLeft = Offset(w * 0.88f, h * 0.25f),
-                            size = Size(w * 0.12f, h * 0.5f))
-                        // 충전량
-                        val fillW = w * 0.84f * (batteryLvl / 100f).coerceIn(0f, 1f)
-                        if (fillW > 0) drawRoundRect(batteryColor,
-                            topLeft = Offset(2f, 2f), size = Size(fillW, h - 4f),
-                            cornerRadius = androidx.compose.ui.geometry.CornerRadius(2f))
+                if (!isConnected) {
+                    Row(verticalAlignment = Alignment.CenterVertically) {
+                        Icon(
+                            Icons.Default.BluetoothDisabled,
+                            contentDescription = "Disconnected",
+                            tint = Color.Red,
+                            modifier = Modifier.size(16.dp)
+                        )
+                        Spacer(modifier = Modifier.width(4.dp))
+                        Text(
+                            "Disconnect",
+                            fontSize = (12 * fontScale).sp,
+                            fontWeight = FontWeight.Bold,
+                            color = Color.Red
+                        )
+                    }
+                } else {
+                    val batteryColor = when {
+                        batteryLvl >= 60 -> Color(0xFF4CAF50)
+                        batteryLvl >= 30 -> Color(0xFFFF9800)
+                        else -> Color.Red
+                    }
+                    Row(verticalAlignment = Alignment.CenterVertically) {
+                        // 배터리 바 아이콘 (Canvas로 직접 그리기)
+                        Canvas(modifier = Modifier.size(width = 22.dp, height = 12.dp)) {
+                            val w = size.width; val h = size.height
+                            drawRoundRect(Color.Gray, topLeft = Offset(0f, 0f),
+                                size = Size(w * 0.88f, h), cornerRadius = androidx.compose.ui.geometry.CornerRadius(3f),
+                                style = Stroke(width = 1.5f))
+                            drawRect(Color.Gray, topLeft = Offset(w * 0.88f, h * 0.25f),
+                                size = Size(w * 0.12f, h * 0.5f))
+                            val fillW = w * 0.84f * (batteryLvl / 100f).coerceIn(0f, 1f)
+                            if (fillW > 0) drawRoundRect(batteryColor,
+                                topLeft = Offset(2f, 2f), size = Size(fillW, h - 4f),
+                                cornerRadius = androidx.compose.ui.geometry.CornerRadius(2f))
+                        }
+                        Spacer(modifier = Modifier.width(4.dp))
+                        Text("$batteryLvl%", fontSize = (12 * fontScale).sp, fontWeight = FontWeight.Bold, color = batteryColor)
                     }
-                    Spacer(modifier = Modifier.width(4.dp))
-                    Text("$batteryLvl%", fontSize = (12 * fontScale).sp, fontWeight = FontWeight.Bold, color = batteryColor)
                 }
             }