diff --git a/internal_filesystem/apps/com.micropythonos.showbattery/META-INF/MANIFEST.JSON b/internal_filesystem/apps/com.micropythonos.showbattery/META-INF/MANIFEST.JSON
new file mode 100644
index 00000000..63fbca9e
--- /dev/null
+++ b/internal_filesystem/apps/com.micropythonos.showbattery/META-INF/MANIFEST.JSON
@@ -0,0 +1,24 @@
+{
+"name": "ShowBattery",
+"publisher": "MicroPythonOS",
+"short_description": "Minimal app",
+"long_description": "Demonstrates the simplest app.",
+"icon_url": "https://apps.micropythonos.com/apps/com.micropythonos.helloworld/icons/com.micropythonos.helloworld_0.0.2_64x64.png",
+"download_url": "https://apps.micropythonos.com/apps/com.micropythonos.helloworld/mpks/com.micropythonos.helloworld_0.0.2.mpk",
+"fullname": "com.micropythonos.showbattery",
+"version": "0.0.2",
+"category": "development",
+"activities": [
+    {
+      "entrypoint": "assets/hello.py",
+      "classname": "Hello",
+      "intent_filters": [
+        {
+          "action": "main",
+          "category": "launcher"
+        }
+      ]
+    }
+  ]
+}
+
diff --git a/internal_filesystem/apps/com.micropythonos.showbattery/assets/hello.py b/internal_filesystem/apps/com.micropythonos.showbattery/assets/hello.py
new file mode 100644
index 00000000..7e0ac09e
--- /dev/null
+++ b/internal_filesystem/apps/com.micropythonos.showbattery/assets/hello.py
@@ -0,0 +1,87 @@
+"""
+8:44 4.15V
+8:46 4.13V
+
+import time
+v = mpos.battery_voltage.read_battery_voltage()
+percent = mpos.battery_voltage.get_battery_percentage()
+text = f"{time.localtime()}: {v}V is {percent}%"
+text
+
+from machine import ADC, Pin # do this inside the try because it will fail on desktop
+adc = ADC(Pin(13))
+# Set ADC to 11dB attenuation for 0–3.3V range (common for ESP32)
+adc.atten(ADC.ATTN_11DB)
+adc.read()
+
+scale factor 0.002 is (4.15 / 4095) * 2
+BUT shows 4.90 instead of 4.13
+BUT shows 5.018 instead of 4.65 (raw ADC read: 2366)
+SO substract 0.77
+# at 2366
+
+2506 is 4.71 (not 4.03)
+scale factor 0.002 is (4.15 / 4095) * 2
+BUT shows 4.90 instead of 4.13
+BUT shows 5.018 instead of 4.65 (raw ADC read: 2366)
+SO substract 0.77
+# at 2366
+
+USB power:
+2506 is 4.71 (not 4.03)
+2498
+2491
+
+battery power:
+2482 is 4.180
+2470 is 4.170
+2457 is 4.147
+2433 is 4.109
+2429 is 4.102
+2393 is 4.044
+2369 is 4.000
+2343 is 3.957
+2319 is 3.916
+2269 is 3.831
+
+"""
+
+import lvgl as lv
+import time
+
+import mpos.battery_voltage
+from mpos.apps import Activity
+
+class Hello(Activity):
+
+    refresh_timer = None
+    
+    # Widgets:
+    raw_label = None
+
+    def onCreate(self):
+        s = lv.obj()
+        self.raw_label = lv.label(s)
+        self.raw_label.set_text("starting...")
+        self.raw_label.center()
+        self.setContentView(s)
+
+    def onResume(self, screen):
+        super().onResume(screen)
+
+        def update_bat(timer):
+            #global l
+            r = mpos.battery_voltage.read_raw_adc()
+            v = mpos.battery_voltage.read_battery_voltage()
+            percent = mpos.battery_voltage.get_battery_percentage()
+            text = f"{time.localtime()}\n{r}\n{v}V\n{percent}%"
+            #text = f"{time.localtime()}: {r}"
+            print(text)
+            self.update_ui_threadsafe_if_foreground(self.raw_label.set_text, text)
+
+        self.refresh_timer = lv.timer_create(update_bat,1000,None) #.set_repeat_count(10)
+
+    def onPause(self, screen):
+        super().onPause(screen)
+        if self.refresh_timer:
+            self.refresh_timer.delete()