Monitor your device battery health and charging status instantly with this free Battery Status API viewer. Track charge levels and time remaining in real-time.
AI Generation Prompt
Battery Status API Viewer Specification
Overview
A clean, professional, and responsive single-page application designed to visualize battery metrics provided by the browser's native Battery Status API. The tool will provide immediate visual feedback on device charging status, current percentage, and projected time for charging or discharging.
Core Features
- Real-Time Monitoring: Automatically updates UI when battery level or charging status changes using
onlevelchangeandonchargingchangeevents. - Visual Battery Component: A large, CSS-rendered battery icon that visually depletes or fills based on the percentage.
- Metric Dashboard: Display cards for 'Charge Level', 'Charging Status', 'Time to Full', and 'Time to Empty'.
- Compatibility Check: A smart banner that detects if the Battery Status API is available in the user's browser, providing a helpful explanation if not.
- Responsive Layout: Adaptive design that centers the primary dashboard on desktops and stacks metrics on mobile.
UI/UX Layout
- Header: Simple title area with a subtle icon.
- Main Display: A central, large container holding the animated battery visual. The battery color should shift based on percentage (Green > 50%, Yellow 20-50%, Red < 20%).
- Metrics Grid: A 2x2 grid below the visualizer displaying formatted numeric data and time calculations.
- Aesthetic: Minimalist SaaS style. Using a color palette of soft whites (#FFFFFF), light grays (#F8FAFC), and high-contrast primary text (#334155). Borders should be thin and subtle (#E2E8F0).
Technical Implementation Constraints
- Single File: Everything in one
.htmlfile. CSS in<style>, JS in<script>. - No Persistence: Use memory variables only. Strictly no
localStorage,sessionStorage, or cookies. - Sandboxed Compatibility: Avoid
alert(),prompt(), andconfirm(). Use DOM-based overlay modals for any notifications. - Responsive: Use CSS Flexbox/Grid for layout. No fixed pixel widths for main containers.
- Transitions: Use
transition: all 0.3s ease-in-outfor battery width changes and UI updates to ensure a smooth, premium feel.
Developer Instructions
- Use Vanilla JavaScript only.
- Ensure the Battery API logic is wrapped in a
try...catchblock to handle browsers where the API is missing. - Format time (seconds) into human-readable strings (e.g., "2 hours, 15 minutes").
- Use Tailwind CSS via CDN for rapid styling and consistency.
Spread the word
Files being used
Frequently Asked Questions
Everything you need to know about using this application.
How does this battery status tool work within my web browser?
This application utilizes the Navigator Battery Status API, which is a native web feature that allows browsers to communicate with your device's power management system. By calling this API, the browser can retrieve real-time data regarding the battery's current charge level, whether it is plugged into a power source, and the estimated time remaining. Because this tool runs entirely in your browser using standard JavaScript, it acts as a lightweight interface between the OS power metrics and your display. It does not require any background drivers or separate software installations to provide accurate, up-to-the-second readings on supported devices.
Why is my battery information not displaying correctly?
The Battery Status API has varying levels of support across different web browsers and operating systems. Some major browsers, such as Safari and Firefox, have deprecated or disabled this API for privacy reasons to prevent potential fingerprinting, where websites might use battery levels as a unique identifier to track users. If you see a notice indicating that the API is unsupported, it is likely due to the browser's privacy policy or hardware restrictions. For the best compatibility and most accurate real-time data, ensure you are using a Chromium-based browser that currently permits access to this hardware information.
Is this battery monitoring application safe to use?
Yes, this application is completely safe because it is a client-side tool. All processing happens locally within your browser's memory, meaning your battery data is never transmitted to a server, stored in a database, or shared with third parties. We prioritize your privacy by ensuring the application remains stateless. Furthermore, because the tool is built without any external tracking scripts or persistent storage mechanisms, you can be confident that your usage remains anonymous. There is no installation process involved, so you can close the tab at any time to immediately end the monitoring session.
Does this tool save or log my battery history?
No, this application is strictly designed to be stateless and does not use any form of persistence. It does not utilize cookies, localStorage, or IndexedDB, meaning it cannot remember your past battery performance, save your preferences, or log charging history between browser sessions. Once you close the browser tab or navigate away from the page, all data in memory is purged. This design ensures that the tool remains a simple, ephemeral utility that fulfills its specific purpose of viewing current device status without creating any digital footprint or tracking your usage over time.
