diff --git a/App.tsx b/App.tsx
index 5e30811..e87a205 100644
--- a/App.tsx
+++ b/App.tsx
@@ -1,4 +1,5 @@
-import AsyncStorage from '@react-native-async-storage/async-storage';
+import {useAsyncStorage} from '@react-native-async-storage/async-storage';
+import Ionicon from 'react-native-vector-icons/Ionicons';
 import {createMaterialTopTabNavigator} from '@react-navigation/material-top-tabs';
 import {
   DarkTheme,
@@ -7,6 +8,11 @@ import {
 } from '@react-navigation/native';
 import React, {useEffect} from 'react';
 import {StatusBar, useColorScheme} from 'react-native';
+import {
+  DarkTheme as DarkThemePaper,
+  DefaultTheme as DefaultThemePaper,
+  Provider,
+} from 'react-native-paper';
 import {setupSchema} from './db';
 import Exercises from './Exercises';
 import Home from './Home';
@@ -25,23 +31,38 @@ setupSchema();
 
 const App = () => {
   const dark = useColorScheme() === 'dark';
+  const {getItem: getMinutes, setItem: setMinutes} = useAsyncStorage('minutes');
+  const {getItem: getSeconds, setItem: setSeconds} = useAsyncStorage('seconds');
+  const {getItem: getAlarmEnabled, setItem: setAlarmEnabled} =
+    useAsyncStorage('alarmEnabled');
+
+  const defaults = async () => {
+    const minutes = await getMinutes();
+    if (minutes === null) await setMinutes('3');
+    const seconds = await getSeconds();
+    if (seconds === null) await setSeconds('30');
+    const alarmEnabled = await getAlarmEnabled();
+    if (alarmEnabled === null) await setAlarmEnabled('false');
+  };
 
   useEffect(() => {
-    AsyncStorage.getItem('minutes').then(async minutes => {
-      if (!minutes) await AsyncStorage.setItem('minutes', '3');
-    });
+    defaults();
   }, []);
 
   return (
-    <NavigationContainer theme={dark ? DarkTheme : DefaultTheme}>
-      <StatusBar barStyle={dark ? 'light-content' : 'dark-content'} />
-      <Tab.Navigator>
-        <Tab.Screen name="Home" component={Home} />
-        <Tab.Screen name="Plans" component={Plans} />
-        <Tab.Screen name="Exercises" component={Exercises} />
-        <Tab.Screen name="Settings" component={Settings} />
-      </Tab.Navigator>
-    </NavigationContainer>
+    <Provider
+      theme={dark ? DarkThemePaper : DefaultThemePaper}
+      settings={{icon: props => <Ionicon {...props} />}}>
+      <NavigationContainer theme={dark ? DarkTheme : DefaultTheme}>
+        <StatusBar barStyle={dark ? 'light-content' : 'dark-content'} />
+        <Tab.Navigator>
+          <Tab.Screen name="Home" component={Home} />
+          <Tab.Screen name="Plans" component={Plans} />
+          <Tab.Screen name="Exercises" component={Exercises} />
+          <Tab.Screen name="Settings" component={Settings} />
+        </Tab.Navigator>
+      </NavigationContainer>
+    </Provider>
   );
 };
 
diff --git a/BatteryDialog.tsx b/BatteryDialog.tsx
new file mode 100644
index 0000000..00e8564
--- /dev/null
+++ b/BatteryDialog.tsx
@@ -0,0 +1,33 @@
+import React from 'react';
+import {NativeModules, Text} from 'react-native';
+import {Button, Dialog, Portal} from 'react-native-paper';
+
+export default function BatteryDialog({
+  show,
+  setShow,
+}: {
+  show: boolean;
+  setShow: (show: boolean) => void;
+}) {
+  const ok = () => {
+    NativeModules.AlarmModule.openBatteryOptimizations();
+    setShow(false);
+  };
+
+  return (
+    <Portal>
+      <Dialog visible={show} onDismiss={() => setShow(false)}>
+        <Dialog.Title>Battery optimizations</Dialog.Title>
+        <Dialog.Content>
+          <Text>
+            Disable battery optimizations for Massive to use rest timers. Settings -> Apps -> Massive -> Battery -> Unrestricted.
+          </Text>
+        </Dialog.Content>
+        <Dialog.Actions>
+          <Button onPress={ok}>Open settings</Button>
+          <Button onPress={() => setShow(false)}>Cancel</Button>
+        </Dialog.Actions>
+      </Dialog>
+    </Portal>
+  );
+}
diff --git a/EditPlan.tsx b/EditPlan.tsx
index 1c04ae4..2ab948e 100644
--- a/EditPlan.tsx
+++ b/EditPlan.tsx
@@ -1,6 +1,6 @@
 import React, {useEffect, useState} from 'react';
 import {StyleSheet, Text, View} from 'react-native';
-import {Button, Modal, Portal, TextInput} from 'react-native-paper';
+import {Button, Dialog, Modal, Portal, TextInput} from 'react-native-paper';
 import DayMenu from './DayMenu';
 import WorkoutMenu from './WorkoutMenu';
 import {getDb} from './db';
@@ -85,12 +85,9 @@ export default function EditPlan({
 
   return (
     <Portal>
-      <Modal
-        visible={show}
-        contentContainerStyle={styles.modal}
-        onDismiss={() => setShow(false)}>
-        <Text style={styles.title}>{id ? `Edit "${days}"` : 'Add a plan'}</Text>
-        <View style={{alignItems: 'flex-start'}}>
+      <Dialog visible={show} onDismiss={() => setShow(false)}>
+        <Dialog.Title>{id ? `Edit "${days}"` : 'Add a plan'}</Dialog.Title>
+        <Dialog.Content>
           {days.split(',').map((day, index) => (
             <DayMenu
               index={index}
@@ -112,39 +109,16 @@ export default function EditPlan({
               key={index}
             />
           ))}
-        </View>
-        <View style={styles.bottom}>
+        </Dialog.Content>
+        <Dialog.Actions>
           <Button mode="contained" icon="save" onPress={save}>
             Save
           </Button>
           <Button icon="close" onPress={() => setShow(false)}>
             Cancel
           </Button>
-          {id && (
-            <Button icon="copy" onPress={clearId}>
-              Duplicate
-            </Button>
-          )}
-        </View>
-      </Modal>
+        </Dialog.Actions>
+      </Dialog>
     </Portal>
   );
 }
-
-const styles = StyleSheet.create({
-  modal: {
-    backgroundColor: 'black',
-    padding: 20,
-  },
-  text: {
-    marginBottom: 10,
-  },
-  bottom: {
-    flexDirection: 'row',
-    marginTop: 10,
-  },
-  title: {
-    fontSize: 20,
-    marginBottom: 10,
-  },
-});
diff --git a/EditSet.tsx b/EditSet.tsx
index 9e03ff7..0181d18 100644
--- a/EditSet.tsx
+++ b/EditSet.tsx
@@ -1,6 +1,6 @@
 import React, {useEffect, useRef, useState} from 'react';
 import {StyleSheet, Text, View} from 'react-native';
-import {Button, Modal, Portal, TextInput} from 'react-native-paper';
+import {Button, Dialog, Modal, Portal, TextInput} from 'react-native-paper';
 import {getDb} from './db';
 import Set from './set';
 import {format} from 'date-fns';
@@ -62,75 +62,62 @@ export default function EditSet({
 
   return (
     <Portal>
-      <Modal
-        visible={show}
-        contentContainerStyle={styles.modal}
-        onDismiss={() => setShow(false)}>
-        <Text style={styles.title}>{id ? `Edit "${name}"` : 'Add a set'}</Text>
-        <TextInput
-          style={styles.text}
-          autoFocus
-          label="Name *"
-          value={name}
-          onChangeText={setName}
-          onSubmitEditing={() => repsRef.current?.focus()}
-        />
-        <TextInput
-          style={styles.text}
-          label="Reps *"
-          keyboardType="numeric"
-          value={reps}
-          onChangeText={setReps}
-          ref={repsRef}
-          onSubmitEditing={() => weightRef.current?.focus()}
-        />
-        <TextInput
-          style={styles.text}
-          label="Weight *"
-          keyboardType="numeric"
-          value={weight}
-          onChangeText={setWeight}
-          onSubmitEditing={save}
-          ref={weightRef}
-        />
-        <TextInput
-          style={styles.text}
-          label="Unit (kg)"
-          value={unit}
-          onChangeText={setUnit}
-          ref={unitRef}
-          onSubmitEditing={save}
-        />
-        <Text style={styles.text}>{format(created, 'PPPP p')}</Text>
-        <View style={styles.bottom}>
-          <Button mode="contained" icon="save" onPress={save}>
-            Save
-          </Button>
+      <Dialog visible={show} onDismiss={() => setShow(false)}>
+        <Dialog.Title>{id ? `Edit "${name}"` : 'Add a set'}</Dialog.Title>
+        <Dialog.Content>
+          <TextInput
+            style={styles.text}
+            autoFocus
+            label="Name *"
+            value={name}
+            onChangeText={setName}
+            onSubmitEditing={() => repsRef.current?.focus()}
+          />
+          <TextInput
+            style={styles.text}
+            label="Reps *"
+            keyboardType="numeric"
+            value={reps}
+            onChangeText={setReps}
+            ref={repsRef}
+            onSubmitEditing={() => weightRef.current?.focus()}
+          />
+          <TextInput
+            style={styles.text}
+            label="Weight *"
+            keyboardType="numeric"
+            value={weight}
+            onChangeText={setWeight}
+            onSubmitEditing={save}
+            ref={weightRef}
+          />
+          <TextInput
+            style={styles.text}
+            label="Unit (kg)"
+            value={unit}
+            onChangeText={setUnit}
+            ref={unitRef}
+            onSubmitEditing={save}
+          />
+          <Text style={styles.text}>{format(created, 'PPPP p')}</Text>
+        </Dialog.Content>
+        <Dialog.Actions>
           <Button icon="close" onPress={() => setShow(false)}>
             Cancel
           </Button>
-          {id && (
-            <Button icon="copy" onPress={clearId}>
-              Duplicate
-            </Button>
-          )}
-        </View>
-      </Modal>
+          <Button mode="contained" icon="save" onPress={save}>
+            Save
+          </Button>
+        </Dialog.Actions>
+      </Dialog>
     </Portal>
   );
 }
 
 const styles = StyleSheet.create({
-  modal: {
-    backgroundColor: 'black',
-    padding: 20,
-  },
   text: {
     marginBottom: 10,
   },
-  bottom: {
-    flexDirection: 'row',
-  },
   title: {
     fontSize: 20,
     marginBottom: 10,
diff --git a/Home.tsx b/Home.tsx
index e752470..0a6dd07 100644
--- a/Home.tsx
+++ b/Home.tsx
@@ -86,15 +86,13 @@ export default function Home() {
         refreshing={refreshing}
         onRefresh={refresh}
       />
-      <View style={styles.bottom}>
-        <EditSet
-          clearId={() => setId(undefined)}
-          id={id}
-          show={showEdit}
-          setShow={setShowEdit}
-          onSave={save}
-        />
-      </View>
+      <EditSet
+        clearId={() => setId(undefined)}
+        id={id}
+        show={showEdit}
+        setShow={setShowEdit}
+        onSave={save}
+      />
 
       <AnimatedFAB
         extended={false}
diff --git a/Settings.tsx b/Settings.tsx
index 2bf7205..f8338ff 100644
--- a/Settings.tsx
+++ b/Settings.tsx
@@ -5,6 +5,7 @@ import {NativeModules, StyleSheet, Text, View} from 'react-native';
 import {Button, Snackbar, Switch, TextInput} from 'react-native-paper';
 import {RootStackParamList} from './App';
 import {getDb} from './db';
+import BatteryDialog from './BatteryDialog';
 
 export default function Settings({
   navigation,
@@ -13,6 +14,7 @@ export default function Settings({
   const [seconds, setSeconds] = useState<string>('');
   const [alarmEnabled, setAlarmEnabled] = useState<boolean>(true);
   const [snackbar, setSnackbar] = useState('');
+  const [showBattery, setShowBattery] = useState(false);
 
   useEffect(() => {
     (async () => {
@@ -43,6 +45,16 @@ export default function Settings({
     NativeModules.ImportModule.sets();
   };
 
+  const changeAlarmEnabled = (enabled: boolean) => {
+    if (!enabled) return setAlarmEnabled(enabled);
+    NativeModules.AlarmModule.ignoringBatteryOptimizations(
+      (ignoring: boolean) => {
+        if (ignoring) return setAlarmEnabled(true);
+        setShowBattery(true);
+      },
+    );
+  };
+
   return (
     <View style={styles.container}>
       <TextInput
@@ -65,7 +77,7 @@ export default function Settings({
       <Switch
         style={[styles.text, {alignSelf: 'flex-start'}]}
         value={alarmEnabled}
-        onValueChange={setAlarmEnabled}
+        onValueChange={changeAlarmEnabled}
       />
       <Button
         style={{alignSelf: 'flex-start'}}
@@ -86,6 +98,8 @@ export default function Settings({
         Delete all data
       </Button>
 
+      <BatteryDialog show={showBattery} setShow={setShowBattery} />
+
       <Snackbar
         visible={!!snackbar}
         onDismiss={() => setSnackbar('')}
diff --git a/android/app/src/main/AndroidManifest.xml b/android/app/src/main/AndroidManifest.xml
index dc4086e..025fe15 100644
--- a/android/app/src/main/AndroidManifest.xml
+++ b/android/app/src/main/AndroidManifest.xml
@@ -7,6 +7,7 @@
     <uses-permission android:name="android.permission.SCHEDULE_EXACT_ALARM" />
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
+    <uses-permission android:name="android.permission.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS" />
 
     <application
         android:name=".MainApplication"
diff --git a/android/app/src/main/java/com/massive/AlarmModule.kt b/android/app/src/main/java/com/massive/AlarmModule.kt
index 6b341bb..43280ae 100644
--- a/android/app/src/main/java/com/massive/AlarmModule.kt
+++ b/android/app/src/main/java/com/massive/AlarmModule.kt
@@ -1,13 +1,19 @@
 package com.massive
 
+import android.content.Context
 import android.content.Intent
+import android.net.Uri
 import android.os.Build
+import android.os.PowerManager
+import android.provider.Settings
 import android.util.Log
 import androidx.annotation.RequiresApi
+import com.facebook.react.bridge.Callback
 import com.facebook.react.bridge.ReactApplicationContext
 import com.facebook.react.bridge.ReactContextBaseJavaModule
 import com.facebook.react.bridge.ReactMethod
 
+
 class AlarmModule internal constructor(context: ReactApplicationContext?) :
     ReactContextBaseJavaModule(context) {
 
@@ -23,4 +29,26 @@ class AlarmModule internal constructor(context: ReactApplicationContext?) :
         intent.putExtra("milliseconds", milliseconds)
         reactApplicationContext.startService(intent)
     }
+
+    @RequiresApi(Build.VERSION_CODES.M)
+    @ReactMethod
+    fun ignoringBatteryOptimizations(callback: Callback) {
+        val packageName = reactApplicationContext.packageName
+        val pm =
+            reactApplicationContext.getSystemService(Context.POWER_SERVICE) as PowerManager
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+            callback.invoke(pm.isIgnoringBatteryOptimizations(packageName))
+        } else {
+            callback.invoke(true)
+        }
+    }
+
+    @RequiresApi(Build.VERSION_CODES.M)
+    @ReactMethod
+    fun openBatteryOptimizations() {
+        val intent = Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS)
+        intent.data = Uri.parse("package:" + reactApplicationContext.packageName)
+        intent.flags = Intent.FLAG_ACTIVITY_NEW_TASK
+        reactApplicationContext.startActivity(intent)
+    }
 }
diff --git a/index.js b/index.js
index cb3fdfc..5a97e4a 100644
--- a/index.js
+++ b/index.js
@@ -1,20 +1,7 @@
+import {AppRegistry} from 'react-native';
 import 'react-native-gesture-handler';
 import 'react-native-sqlite-storage';
-import React from 'react';
-import {AppRegistry} from 'react-native';
 import App from './App';
 import {name as appName} from './app.json';
-import {Provider as PaperProvider, DarkTheme} from 'react-native-paper';
-import Ionicon from 'react-native-vector-icons/Ionicons';
 
-export default function Main() {
-  return (
-    <PaperProvider
-      theme={DarkTheme}
-      settings={{icon: props => <Ionicon {...props} />}}>
-      <App />
-    </PaperProvider>
-  );
-}
-
-AppRegistry.registerComponent(appName, () => Main);
+AppRegistry.registerComponent(appName, () => App);