Battery Status Monitor

Automatic Pause of Large Downloads

Google Play Store and App Store pause app downloads when battery falls below 15% and you're not charging. A 2GB game download would drain your battery completely. The download auto-resumes when you plug in, preventing your phone from dying mid-download.

navigator.getBattery().then((battery) => {
  battery.addEventListener('levelchange', () => {
    if (battery.level < 0.15 && !battery.charging) {
      pauseAllDownloads();
      showNotification('Downloads paused to preserve battery');
    }
  });

  battery.addEventListener('chargingchange', () => {
    if (battery.charging) {
      resumeAllDownloads();
    }
  });
});

Deferred System Updates

Operating systems defer non-critical updates when on battery power. Windows Update won't install that 3GB update unless you're plugged in AND have >50% battery. This prevents your laptop from dying during an update (which can corrupt the OS).

Cloud Backup Scheduling

Google Photos and iCloud Photos stop backing up your photos when battery is low. Uploading hundreds of photos uses significant CPU (compression) and network (upload). Backups resume automatically when you charge overnight.

Simplified UI Mode

Microsoft Teams and Slack switch to 'lightweight mode' on low battery. High-resolution profile pictures become initials. Animated emojis become static. Rich text formatting is simplified. The app remains functional but uses 40% less resources.

Smart Notification Batching

Instead of vibrating your phone 50 times for 50 notifications (each vibration uses battery), apps like Android batch notifications when battery is below 25%. You get one vibration for 10 notifications. This small change extends battery by 10-15 minutes.

Location Tracking Accuracy

Fitness apps like Strava use high-accuracy GPS (every 1 second) when battery is >50%. Below 50%, they switch to balanced mode (every 5 seconds). Below 20%, they use low-power mode (WiFi/cell tower triangulation). You still get your run tracked, but battery drain reduces by 60%.

Graphics Quality Adjustment

Mobile games like PUBG and Genshin Impact detect low battery and offer to reduce graphics quality. They lower: frame rate (60fps → 30fps), shadows, particle effects, view distance. This can extend gameplay from 20 minutes to 45 minutes on low battery.

Battery Drain Warnings

Video editing apps like Adobe Premiere Rush show warnings: 'Exporting this 4K video will take 30 minutes and drain 45% battery. Plug in or reduce quality.' This transparency helps users make informed decisions about whether to start resource-intensive tasks.

Meeting Mode Optimization

Zoom and Microsoft Teams reduce video quality and disable virtual backgrounds when battery is low during video calls. They also suggest switching to audio-only mode. 'Your battery is at 18%. Switch to audio-only to extend call time by 25 minutes?'

Presentation Mode Protection

PowerPoint and Google Slides show a warning before starting a presentation if battery is <30% and not charging: 'Your battery may not last the full presentation. Plug in now or reduce screen brightness.' Prevents embarrassing mid-presentation shutdowns.