[Example here](battery_example.html).
By Gemini
```js
if ('getBattery' in navigator) {
navigator.getBattery().then(function(battery) {
// 1. Get initial battery details
console.log("Battery Level: " + (battery.level * 100) + "%");
console.log("Is Charging? " + (battery.charging ? "Yes" : "No"));
// 2. Listen for level changes
battery.addEventListener('levelchange', function() {
console.log("Updated Level: " + (battery.level * 100) + "%");
});
// 3. Listen for charger plug/unplug
battery.addEventListener('chargingchange', function() {
console.log("Updated Charging Status: " + battery.charging);
});
}).catch(function(error) {
console.error("Battery API error:", error);
});
} else {
console.log("Battery Status API is not supported in this browser/context.");
}
```
Full Example
```html
Android Battery Status Monitor
```