diff --git a/examples/companion_radio/ui-new/UITask.cpp b/examples/companion_radio/ui-new/UITask.cpp
index 6f363d7f96..2dc795420b 100644
--- a/examples/companion_radio/ui-new/UITask.cpp
+++ b/examples/companion_radio/ui-new/UITask.cpp
@@ -821,26 +821,31 @@ void UITask::loop() {
 
 #ifdef AUTO_SHUTDOWN_MILLIVOLTS
   if (millis() > next_batt_chck) {
-    uint16_t milliVolts = getBattMilliVolts();
-    if (milliVolts > 0 && milliVolts < AUTO_SHUTDOWN_MILLIVOLTS) {
-
-      // show low battery shutdown alert
-      // we should only do this for eink displays, which will persist after power loss
-      #if defined(THINKNODE_M1) || defined(LILYGO_TECHO)
-      if (_display != NULL) {
-        _display->startFrame();
-        _display->setTextSize(2);
-        _display->setColor(DisplayDriver::RED);
-        _display->drawTextCentered(_display->width() / 2, 20, "Low Battery.");
-        _display->drawTextCentered(_display->width() / 2, 40, "Shutting Down!");
-        _display->endFrame();
-      }
-      #endif
+    uint32_t now = millis();
+    if (!_board->isBattReadSafe(now)) {
+      // TX just completed — voltage hasn't recovered yet; retry after settle window.
+      next_batt_chck = now + POST_TX_BATT_SETTLE_MS + 50;
+    } else {
+      uint16_t milliVolts = getBattMilliVolts();
+      if (milliVolts > 0 && milliVolts < AUTO_SHUTDOWN_MILLIVOLTS) {
+
+        // show low battery shutdown alert
+        // we should only do this for eink displays, which will persist after power loss
+        #if defined(THINKNODE_M1) || defined(LILYGO_TECHO)
+        if (_display != NULL) {
+          _display->startFrame();
+          _display->setTextSize(2);
+          _display->setColor(DisplayDriver::RED);
+          _display->drawTextCentered(_display->width() / 2, 20, "Low Battery.");
+          _display->drawTextCentered(_display->width() / 2, 40, "Shutting Down!");
+          _display->endFrame();
+        }
+        #endif
 
-      shutdown();
+        shutdown();
 
-    }
-    next_batt_chck = millis() + 8000;
+      }
+      next_batt_chck = millis() + 8000;
   }
 #endif
 }
diff --git a/examples/simple_sensor/SensorMesh.cpp b/examples/simple_sensor/SensorMesh.cpp
index 879fcbf026..cf78dc6e96 100644
--- a/examples/simple_sensor/SensorMesh.cpp
+++ b/examples/simple_sensor/SensorMesh.cpp
@@ -920,6 +920,10 @@ void SensorMesh::loop() {
 
   uint32_t curr = getRTCClock()->getCurrentTime();
   if (curr >= last_read_time + SENSOR_READ_INTERVAL_SECS) {
+    // Skip this cycle if TX just completed — the current spike sags battery
+    // voltage enough to falsely trigger low-battery alerts on weaker cells.
+    // The loop runs again in milliseconds, so the read is only deferred briefly.
+    if (!board.isBattReadSafe(millis())) return;
     telemetry.reset();
     telemetry.addVoltage(TELEM_CHANNEL_SELF, (float)board.getBattMilliVolts() / 1000.0f);
     // query other sensors -- target specific
diff --git a/src/MeshCore.h b/src/MeshCore.h
index b4c57faf32..b2da661b20 100644
--- a/src/MeshCore.h
+++ b/src/MeshCore.h
@@ -41,8 +41,29 @@ namespace mesh {
 #define  BD_STARTUP_NORMAL     0  // getStartupReason() codes
 #define  BD_STARTUP_RX_PACKET  1
 
+// Milliseconds to wait after TX completes before trusting battery ADC readings.
+// LoRa TX causes a current spike that sags battery terminal voltage; on LiPo
+// cells below ~50% SoC the sag is large enough to cross shutdown/alert thresholds.
+#ifndef POST_TX_BATT_SETTLE_MS
+#define POST_TX_BATT_SETTLE_MS 250
+#endif
+
 class MainBoard {
+
+  bool     _tx_active           = false;
+  uint32_t _last_tx_complete_ms = 0;
+
 public:
+  // Called by the radio layer — not meant to be overridden.
+  void notifyTxStart()                   { _tx_active = true; }
+  void notifyTxComplete(uint32_t now_ms) { _tx_active = false; _last_tx_complete_ms = now_ms; }
+
+  // Returns true when it is safe to read the battery ADC (TX not in progress
+  // and enough time has elapsed since the last transmission for voltage to recover).
+  bool isBattReadSafe(uint32_t now_ms, uint32_t settle_ms = POST_TX_BATT_SETTLE_MS) const {
+    return !_tx_active && (now_ms - _last_tx_complete_ms >= settle_ms);
+  }
+
   virtual uint16_t getBattMilliVolts() = 0;
   virtual float getMCUTemperature() { return NAN; }
   virtual bool setAdcMultiplier(float multiplier) { return false; };
diff --git a/src/helpers/radiolib/RadioLibWrappers.cpp b/src/helpers/radiolib/RadioLibWrappers.cpp
index b6519aefa7..eb354c3e67 100644
--- a/src/helpers/radiolib/RadioLibWrappers.cpp
+++ b/src/helpers/radiolib/RadioLibWrappers.cpp
@@ -151,6 +151,7 @@ uint32_t RadioLibWrapper::getEstAirtimeFor(int len_bytes) {
 }
 
 bool RadioLibWrapper::startSendRaw(const uint8_t* bytes, int len) {
+  _board->notifyTxStart();
   _board->onBeforeTransmit();
   int err = _radio->startTransmit((uint8_t *) bytes, len);
   if (err == RADIOLIB_ERR_NONE) {
@@ -160,6 +161,7 @@ bool RadioLibWrapper::startSendRaw(const uint8_t* bytes, int len) {
   MESH_DEBUG_PRINTLN("RadioLibWrapper: error: startTransmit(%d)", err);
   idle();   // trigger another startRecv()
   _board->onAfterTransmit();
+  _board->notifyTxComplete(millis());
   return false;
 }
 
@@ -175,6 +177,7 @@ bool RadioLibWrapper::isSendComplete() {
 void RadioLibWrapper::onSendFinished() {
   _radio->finishTransmit();
   _board->onAfterTransmit();
+  _board->notifyTxComplete(millis());
   state = STATE_IDLE;
 }