diff --git a/ms-atmega328p--e01c-ml01s--aht10.ino b/ms-atmega328p--e01c-ml01s--aht10.ino
index 077cb5d..99a8d1e 100644
--- a/ms-atmega328p--e01c-ml01s--aht10.ino
+++ b/ms-atmega328p--e01c-ml01s--aht10.ino
@@ -8,6 +8,22 @@
 
 #define MY_RF24_CHANNEL 14
 
+
+// INFO coincell optimization
+// https://www.openhardware.io/view/398/NModule-Temperature-Humidity-Light-Door-sensor-shield#tabs-source
+#define MY_TRANSPORT_UPLINK_CHECK_DISABLED
+
+// Timeout for transport to be ready during initialization, after this duration, even if it didn't manage to enable transport the node will enter the loop() method
+// For battery powered nodes, I set this to 5000 so after 5 seconds it will stop eating the battery
+// 5s is long enough to connect to gateway so you should connect your node back to your computer and check the log if your node cannot connect
+#define MY_TRANSPORT_WAIT_READY_MS  5000 // no more than 5 seconds of waiting for transport to be ready
+
+// Reduce maximum delay before going to sleep, as we do not want to kill the battery if gateway is not available
+// Before going to sleep MySensors will make sure we don't have a connection problem to MySensors network
+// If this value is too high and you have connection problem, MySensors will never go to sleep and bye bye battery ...
+// If using AA/AAA batteries you can set a longer duration like 5000ms
+#define MY_SLEEP_TRANSPORT_RECONNECT_TIMEOUT_MS 2000
+
 // #define MY_SIGNING_SIMPLE_PASSWD "C@KptBi1L@5op?8!"
 // #define MY_SECURITY_SIMPLE_PASSWD "C@KptBi1L@5op?8!"
 
@@ -26,7 +42,9 @@ static const uint64_t UPDATE_INTERVAL = 900000; // (15min * 60sec = 900 seconds
 
 bool metric = true;
 float ahtTemp;                               //to store T/RH result
+float last_ahtTemp;                               //to store T/RH result
 float ahtHumi;
+float last_ahtHumi;
 
 int oldBatteryPcnt = 0;
 #define FULL_BATTERY 3 // 3V for 2xAA alkaline. Adjust if you use a different battery setup.
@@ -45,21 +63,33 @@ MyMessage msgBatVPrefix(CHILD_ID_BATV, V_UNIT_PREFIX);  // Custom unit message.
 AHTxx aht10(0x38, AHT1x_SENSOR); //sensor address, sensor type
 // AHTxx aht10(0x00, 0x38);
 
+// Sleep between sendings to preserve coin cell
+void sleepForCoinCell() {
+  sleep(400);
+}
 
 void presentation()  
 { 
-  Serial.println("- - - - - presentation - - - - -");
-  
+  #ifdef MY_DEBUG
+    Serial.println("- - - - - presentation - - - - -");
+  #endif
+
   // Send the sketch version information to the gateway
-  sendSketchInfo("aht10", "0.4.2");
+  sendSketchInfo("aht10", "0.5");
+  sleepForCoinCell();
   
   // Register all sensors to gw (they will be created as child devices)
   present(CHILD_ID_TEMP, S_TEMP, "Temperature");
+  sleepForCoinCell();
   present(CHILD_ID_HUM, S_HUM, "Humidity");
+  sleepForCoinCell();
   present(CHILD_ID_BAT, S_CUSTOM, "Battery Percent");
+  sleepForCoinCell();
   present(CHILD_ID_BATV, S_CUSTOM, "Battery Voltage");
+  sleepForCoinCell();
   
   metric = getControllerConfig().isMetric;
+  sleepForCoinCell();
 
 }
 
@@ -98,9 +128,14 @@ void loop()
     Serial.println(F(" +-0.3C"));
   #endif
   // static MyMessage msgTemp(CHILD_ID_TEMP, V_TEMP);
-  send(msgTemp.set(ahtTemp, 1));
+  if (ahtTemp != last_ahtTemp)
+  {
+    send(msgTemp.set(ahtTemp, 1));
+    last_ahtTemp = ahtTemp;
+  }
   
-  delay(2000); //measurement with high frequency leads to heating of the sensor, see NOTE
+  
+  sleep(2000); //measurement with high frequency leads to heating of the sensor, see NOTE
 
   ahtHumi = aht10.readHumidity(); //read another 6-bytes via I2C, takes 80 milliseconds
   #ifdef MY_DEBUG
@@ -109,9 +144,14 @@ void loop()
     Serial.println(F(" +-2%"));
   #endif
   // static MyMessage msgHum(CHILD_ID_HUM,  V_HUM);
-  send(msgHum.set(ahtHumi, 1));
+  if (ahtHumi != last_ahtHumi)
+  {
+    send(msgHum.set(ahtHumi, 1));
+    last_ahtHumi = ahtHumi;
+  }
+  
 
-  delay(2000);
+  sleep(2000);
 
   // get the battery Voltage
   long batteryMillivolts = hwCPUVoltage();
@@ -128,10 +168,14 @@ void loop()
 
   if (oldBatteryPcnt != batteryPcnt) {
       sendBatteryLevel(batteryPcnt);
+      sleepForCoinCell();
       oldBatteryPcnt = batteryPcnt;
       send(msgBatPrefix.set("%"));  // Set custom unit.
+      sleepForCoinCell();
       send(msgBat.set(batteryPcnt, 1));
+      sleepForCoinCell();
       send(msgBatVPrefix.set("V"));  // Set custom unit.
+      sleepForCoinCell();
       send(msgBatV.set(batteryVolts, 1));
   }