Here are a few real-world examples from open-source projects that use the Battery Status API, grouped into categories:

App frameworks: major Vue, React Native and Expo, purpose-built Shiny, ftools, SolidJS, Ember.js plugin, Vercel component, another Vercel component, React Template, AppPresser, Open Bank Project Sofit Container, GoPro ForgeJS, Blazor
Productivity/utils: Nylas Mail, Battery Tracker historical data viz, notifications at critical thresholds considering estimated time remaining, Edge ML browser-based toolchain for machine learning on microcontrollers, Battery Monitor remind via notifications if battery below/above user-defined thresholds, Battery Status notifies the user when it's time to plug in or unplug the laptop to maximize the battery life, Battery display, System Info Viewer
Emulators: Win11, Win12, Ubuntu, Web3OS, Portfolio OS, RetroArch SNES/GB/Sega, Win7
- Note: Fullscreen API spoofing attack could be made more convincing when combined with the Battery Status API.
Development: Nutria emulate various web-based OSes, Pantomath Slack webhooks, ws-vs-xhr compare the power consumption of websockets and XMLHttpRequests in web apps, sw-periodic-sync register tasks to be run in a service worker at periodic intervals triggered battery changes, battery-considerate-loading for resources, mdsh static site generator
Browser extensions: Auto Tab Discard discarding is skipped if power is plugged-in, Minimo, Simple New Tab Page, Chrome Newtab for battery information at a glance, ChromeOS Battery trigger custom notifications, fullscreen warning at custom battery levels, System Monitor
Education: HAX
Smart home: Homebridge Browsercam, Home Assistant browser control to create home automations based on the battery status
Messaging: Franz run computationally intensive tasks only when the system is plugged in, Web-Talkie a Push-to-Talk web app
Identity management: IDM Wallet UI adapt desktop/laptop experience based on charging status
Cloud gaming: Better xCloud
Performance monitoring: Boomerang is an open source JavaScript library for real user monitoring (commonly called RUM), it measures the performance characteristics of real-world page loads and interactions, The Great Suspender and The Great-er Discarder-er suspends work based on charging state
Media: YouTube / Code Charity / Battery Considerate Loading (source) select the most appropriate codec, show a static image instead of video autoplay depending on battery level and discharging time estimate, switch to a less power-hungry codec or remind the user up front to plug in if the movieRuntime > dischargingTime, h264ify let user choose to use an energy-efficient codec when plugged in
Automation: Scrapoxy
Sports: Badminton Umpire Panel scoreboard to display badminton scores and warn if the device is running low battery or is unplugged, also Advantage Scout a scouting system, oled-bike-computer
Other: Mine4aCause a nonprofit organization that creates and manages a tool to engage with the communities of non-profit organizations where members harnesses their excess browser CPU capacity to mine crypto-currency

I believe there are many projects built on top popular Vue/React Native/Expo app frameworks that make use of this API. These are however not as easily discoverable as the frameworks themselves.

Uh oh!

Add an explicit use cases and requirements section #25

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