diff --git a/apps.json b/apps.json
index 63fa3a88a..cf7520de0 100644
--- a/apps.json
+++ b/apps.json
@@ -1145,5 +1145,18 @@
     {"name":"devstopwatch.app.js","url":"app.js"},
     {"name":"devstopwatch.img","url":"app-icon.js","evaluate":true}
   ]
-}
+  },
+  { "id": "batchart",
+    "name": "Battery Chart",
+    "shortName":"BatChart",
+    "icon": "app.png",
+    "version":"0.03",
+    "description": "A widget and an app for recording and visualizing battery percentage over time.",
+    "tags": "app,widget,battery,time,record,chart,tool",
+    "storage": [
+      {"name":"batchart.wid.js","url":"widget.js"},
+      {"name":"batchart.app.js","url":"app.js"},
+      {"name":"batchart.img","url":"app-icon.js","evaluate":true}
+    ]
+  }
 ]
diff --git a/apps/batchart/ChangeLog b/apps/batchart/ChangeLog
new file mode 100644
index 000000000..1b77ff82f
--- /dev/null
+++ b/apps/batchart/ChangeLog
@@ -0,0 +1,3 @@
+0.01: New app and widget
+0.02: Widget stores data to file (1 dataset/10min)
+0.03: Rotate log files once a week.
diff --git a/apps/batchart/app-icon.js b/apps/batchart/app-icon.js
new file mode 100644
index 000000000..b41629e01
--- /dev/null
+++ b/apps/batchart/app-icon.js
@@ -0,0 +1 @@
+require("heatshrink").decompress(atob("mEwxH+AH4A/AH4AS64AIF/4pZABYuuGDIv/F/4v/F9+Gw0rAQIASF7YxTF7cxwAvtrdVF9qQTF/4vMYCQvcYCQvcSCQvdqpgQF7oEBYJ4veAoNbF9uGmMrrgvsw2AGILFKF8IACrYxJF8gxDSowvmBwWAF9oPGF9NbmIvtCAovqMAgvqCIgvrrdVF9oSDF9iPuF7crACxf/F++wFqmG2AvXGCouZAH4A/AGY"))
diff --git a/apps/batchart/app.js b/apps/batchart/app.js
new file mode 100644
index 000000000..684f9a88d
--- /dev/null
+++ b/apps/batchart/app.js
@@ -0,0 +1,34 @@
+// place your const, vars, functions or classes here
+
+function renderBatteryChart(){
+  g.drawString("t", 215, 175);
+  g.drawLine(40,190,40,80);
+  
+  g.drawString("%", 39, 70);
+  g.drawString("100", 15, 75);
+  g.drawLine(35,80,40,80);
+  
+  g.drawString("50", 20,125);
+  g.drawLine(35,130,40,130);
+  
+  g.drawString("0", 25, 175);
+  g.drawLine(35,180,210,180);
+  
+  g.drawString("Chart not yet functional", 60, 125);
+}
+
+// special function to handle display switch on
+Bangle.on('lcdPower', (on) => {
+  if (on) {
+    // call your app function here
+    // If you clear the screen, do Bangle.drawWidgets();
+    renderBatteryChart();
+  }
+});
+
+g.clear();
+Bangle.loadWidgets();
+Bangle.drawWidgets();
+// call your app function here
+
+renderBatteryChart();
diff --git a/apps/batchart/app.png b/apps/batchart/app.png
new file mode 100644
index 000000000..9a60d1004
Binary files /dev/null and b/apps/batchart/app.png differ
diff --git a/apps/batchart/batchart.dat b/apps/batchart/batchart.dat
new file mode 100644
index 000000000..e69de29bb
diff --git a/apps/batchart/widget.js b/apps/batchart/widget.js
new file mode 100644
index 000000000..2e2f43cdf
--- /dev/null
+++ b/apps/batchart/widget.js
@@ -0,0 +1,79 @@
+(() => {
+  var switchableConsumers = {
+    none: 0,
+    lcd: 1,
+    compass: 2,
+    bluetooth: 4,
+    gps: 8,
+    hrm: 16
+  };
+
+  var settings = {};
+  var batChartFile; // file for battery percentage recording
+  const recordingInterval10Min = 60 * 10 * 1000;
+  const recordingInterval1Min = 60*1000; //For testing 
+  const recordingInterval10S = 10*1000; //For testing 
+  var recordingInterval = null;
+
+  // draw your widget
+  function draw() {
+    g.reset();
+    g.drawString("BC", this.x, this.y);
+  }
+
+  function getEnabledConsumersValue() {
+    var enabledConsumers = switchableConsumers.none;
+
+    if (Bangle.isLCDOn())
+      enabledConsumers = enabledConsumers | switchableConsumers.lcd;
+    // Already added in the hope they will be available soon to get more details
+    // if (Bangle.isCompassOn())
+    //   enabledConsumers = enabledConsumers | switchableConsumers.compass;
+    // if (Bangle.isBluetoothOn())
+    //   enabledConsumers = enabledConsumers | switchableConsumers.bluetooth;
+    // if (Bangle.isGpsOn())
+    //   enabledConsumers = enabledConsumers | switchableConsumers.gps;
+    // if (Bangle.isHrmOn())
+    //   enabledConsumers = enabledConsumers | switchableConsumers.hrm;
+
+    return enabledConsumers;
+  }
+
+  function logBatteryData() {
+    const previousWriteLogName = "bcprvday";
+    const previousWriteDay = require("Storage").read(previousWriteLogName);
+    const currentWriteDay = new Date().getDay();
+
+    const logFileName = "bclog" + currentWriteDay;
+
+    // Change log target on day change
+    if (previousWriteDay != currentWriteDay) {
+      //Remove a log file containing data from a week ago
+      require("Storage").erase(logFileName);
+      require("Storage").write(previousWriteLogName, currentWriteDay);
+    }
+
+    var bcLogFileA = require("Storage").open(logFileName, "a");
+    if (bcLogFileA) {
+      console.log([getTime().toFixed(0), E.getBattery(), E.getTemperature(), getEnabledConsumersValue()].join(","));
+      bcLogFileA.write([[getTime().toFixed(0), E.getBattery(), E.getTemperature(), getEnabledConsumersValue()].join(",")].join(",")+"\n");
+    }
+  }
+
+  // Called by the heart app to reload settings and decide what's
+  function reload() {
+    WIDGETS["batchart"].width = 24;
+
+    recordingInterval = setInterval(logBatteryData, recordingInterval10Min);
+
+    logBatteryData();
+  }
+
+  // add the widget
+  WIDGETS["batchart"]={area:"tl",width:24,draw:draw,reload:function() {
+    reload();
+    Bangle.drawWidgets(); // relayout all widgets
+  }};
+  // load settings, set correct widget width
+  reload();
+})()
\ No newline at end of file