Battery.js
A tiny JavaScript wrapper for the HTML5 Battery Status API.
As of October 2015 the Battery Status API is supported by Firefox, Chrome, Opera, Android Browser and Chrome for Android: http://caniuse.com/battery-status
Install
$ npm install battery.js
Usage
var Battery = require('battery.js'); // or similar function logBatteryStatus(status) { console.log('Level: ' + Math.floor(status.level * 100) + '%'); // 30% console.log('Charging: ' + status.charging); // true console.log('Time until charged: ' + status.chargingTime); // 3600 (seconds) or Infinity console.log('Battery time left: ' + status.dischargingTime); // 3600 (seconds) or Infinity} // Get battery status as soon as it's availableBattery.getStatus(function(status, error) { if(error) { console.error('Battery status is not supported'); return; } logBatteryStatus(status);}); // Register a handler to get notified when battery status changesBattery.onUpdate(logBatteryStatus);