diff --git a/lib/lang/lang.dart b/lib/lang/lang.dart
index 6c2a9d1..1c1f34a 100644
--- a/lib/lang/lang.dart
+++ b/lib/lang/lang.dart
@@ -149,6 +149,8 @@ abstract class Languages {
 
   String get notifyAt;
 
+  String get notifyWarning;
+
   // Offline
   String get offline;
 
diff --git a/lib/lang/lang_cz.dart b/lib/lang/lang_cz.dart
index 749d04f..445d1ae 100644
--- a/lib/lang/lang_cz.dart
+++ b/lib/lang/lang_cz.dart
@@ -224,4 +224,8 @@ class LanguageCz extends Languages {
   @override
   String get needRemember =>
       "Musíte své přihlašovací údaje uložit na přihlašovací obrazovce";
+
+  @override
+  String get notifyWarning =>
+      "Vaše zařízení může mít povolenou optimalizaci baterie, což může způsobovat neodesílání oznámení. Zkontrolujte nastavení ve vašem zařízení.";
 }
diff --git a/lib/lang/lang_en.dart b/lib/lang/lang_en.dart
index 2e653dc..f0dbd9d 100644
--- a/lib/lang/lang_en.dart
+++ b/lib/lang/lang_en.dart
@@ -222,4 +222,8 @@ class LanguageEn extends Languages {
   @override
   String get needRemember =>
       "You need to save your login details on the login screen first";
+
+  @override
+  String get notifyWarning =>
+      "Your device may have battery optimization enabled. This may cause notifications to not be sent. Check the application info in your device's settings.";
 }
diff --git a/lib/main.dart b/lib/main.dart
index eb561fb..1c7a8c6 100644
--- a/lib/main.dart
+++ b/lib/main.dart
@@ -55,44 +55,44 @@ void oznamitPredem(SharedPreferences prefs, tz.Location l) async {
       title = LanguageEn().lunchNotif;
   }
 
-  if (prefs.getBool("offline") ?? false) {
+  /*if (prefs.getBool("offline") ?? false) {
     // TODO možnost brát z offline dat
-  } else {
-    // bere online
-    var d = await LoginManager.getDetails(); // získat údaje
-    if (d != null) {
-      var c = Canteen(d["url"]!);
-      if (await c.login(d["user"]!, d["pass"]!)) {
-        var jidla = await c.jidelnicekDen();
-        try {
-          var jidlo = jidla.jidla.singleWhere((element) => element.objednano);
-          var kdy = DateTime.parse(prefs.getString("oznameni_cas")!);
-          const AndroidNotificationDetails androidSpec =
-              AndroidNotificationDetails('opencanteen', 'predobjedem',
-                  channelDescription: 'Oznámení o dnešním jídle',
-                  importance: Importance.max,
-                  priority: Priority.high,
-                  ticker: 'today meal');
-          const IOSNotificationDetails iOSpec =
-              IOSNotificationDetails(presentAlert: true, presentBadge: true);
-          await flutterLocalNotificationsPlugin.zonedSchedule(
-              0,
-              title,
-              "${jidlo.nazev} - ${jidlo.varianta}",
-              tz.TZDateTime.from(
-                  casNaDate(
-                    TimeOfDay(hour: kdy.hour, minute: kdy.minute),
-                  ),
-                  l),
-              const NotificationDetails(android: androidSpec, iOS: iOSpec),
-              androidAllowWhileIdle: true,
-              uiLocalNotificationDateInterpretation:
-                  UILocalNotificationDateInterpretation.absoluteTime);
-        } on StateError catch (_) {
-          // nenalezeno
-        }
+  } else {*/
+  // bere online
+  var d = await LoginManager.getDetails(); // získat údaje
+  if (d != null) {
+    var c = Canteen(d["url"]!);
+    if (await c.login(d["user"]!, d["pass"]!)) {
+      var jidla = await c.jidelnicekDen();
+      try {
+        var jidlo = jidla.jidla.singleWhere((element) => element.objednano);
+        var kdy = DateTime.parse(prefs.getString("oznameni_cas")!);
+        const AndroidNotificationDetails androidSpec =
+            AndroidNotificationDetails('opencanteen', 'predobjedem',
+                channelDescription: 'Oznámení o dnešním jídle',
+                importance: Importance.max,
+                priority: Priority.high,
+                ticker: 'today meal');
+        const IOSNotificationDetails iOSpec =
+            IOSNotificationDetails(presentAlert: true, presentBadge: true);
+        await flutterLocalNotificationsPlugin.zonedSchedule(
+            0,
+            title,
+            "${jidlo.nazev} - ${jidlo.varianta}",
+            tz.TZDateTime.from(
+                casNaDate(
+                  TimeOfDay(hour: kdy.hour, minute: kdy.minute),
+                ),
+                l),
+            const NotificationDetails(android: androidSpec, iOS: iOSpec),
+            androidAllowWhileIdle: true,
+            uiLocalNotificationDateInterpretation:
+                UILocalNotificationDateInterpretation.absoluteTime);
+      } on StateError catch (_) {
+        // nenalezeno
       }
     }
+    // }
   }
 }
 
diff --git a/lib/okna/nastaveni.dart b/lib/okna/nastaveni.dart
index 05baa81..6713e61 100644
--- a/lib/okna/nastaveni.dart
+++ b/lib/okna/nastaveni.dart
@@ -143,6 +143,23 @@ class _NastaveniState extends State<Nastaveni> {
                         setState(() {
                           _oznameniObed = value;
                           if (_oznameniObed) {
+                            showDialog(
+                                context: context,
+                                builder: (context) => AlertDialog(
+                                      title:
+                                          Text(Languages.of(context)!.warning),
+                                      content: Text(
+                                          Languages.of(context)!.notifyWarning),
+                                      actions: [
+                                        TextButton(
+                                          child:
+                                              Text(Languages.of(context)!.ok),
+                                          onPressed: () {
+                                            Navigator.of(context).pop();
+                                          },
+                                        )
+                                      ],
+                                    ));
                             vytvoritOznameni(casNaDate(_oznameniCas));
                           }
                           zmenitNastaveni("oznamit", value);
diff --git a/pubspec.yaml b/pubspec.yaml
index 9c73992..4856caa 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -6,7 +6,7 @@ publish_to: 'none'
 # The following defines the version and build number for your application.
 # A version number is three numbers separated by dots, like 1.2.43
 # followed by an optional build number separated by a +.
-version: 1.3.0+15
+version: 1.3.1+16
 
 environment:
   sdk: ">=2.16.1 <3.0.0"