Battery Health

Battery Health is a smart, privacy-first battery monitor that helps you understand your phone's battery like never before. Track real-time charging stats, estimate battery health, discover power-draining apps, and get intelligent alerts—all without creating an account or sending your data anywhere.

💡 Why Battery Health?
Most battery apps are cluttered with ads, make fake claims, or steal your data. Battery Health is different:

Trust & Transparency: Every health number is labeled "estimated" with a visible confidence score. We tell you exactly how accurate each measurement is based on your device's hardware capabilities.

Privacy First: All your battery data stays on your device. No accounts, no servers, and no tracking. Works fully offline for all core features.

Zero Permissions Required: The dashboard works immediately after installation. Grant optional permissions only if you want to unlock deeper features like live charging monitoring and per-app battery insights.

Honest Monetization: Thin, non-intrusive ads on just 3 screens. A one-time Pro upgrade removes ads permanently—no subscription traps.

🚀 Features
Dashboard: See battery percentage, temperature, voltage, current, and estimated health at a glance. The live gauge turns green when charging. Works with zero permissions.

Charging Analytics: Automatically track every charge session with duration, power gained, and a 4-score quality rating (Speed, Temperature, Stability, Completion). Compare chargers and cables to find your fastest setup.

Battery Health Estimation: Get an honest estimate of your battery's remaining capacity based on observed charging behavior. Confidence scoring adapts to your device's hardware, offering full support for charge counter chips and a graceful fallback for budget phones.

Battery Usage Insights: See which apps impact your battery the most, ranked by estimated drain. Powered by Android's UsageStats with clear disclaimers about accuracy.

Smart Alerts: Set customizable charge level alerts (80%, 90%, 100%), overheat warnings, and fast drain notifications. Built with cooldowns to prevent notification spam.

Charging Habits Coach: Rule-based recommendations generated entirely on-device. Get tips on charging temperature trends, overnight drain patterns, and high-charge dwell habits. No AI, no network calls.

Widget: Clean home screen widget shows battery percentage and temperature. Tap to open the app.

CSV Export: Export your charging history and health data to a universal CSV file for your own analysis.

Pro Upgrade (One-Time Purchase): Remove all ads, unlock 90-day history, 3 widget sizes, custom alert thresholds, and unlimited CSV exports. One payment, no subscription.

🔒 Permissions
The app is fully functional with zero permissions granted. You can optionally enable:

Notifications: Enables the live charging monitor with per-minute updates.

Usage Access: Unlocks per-app battery impact estimates.

Foreground Service: Required for background monitoring during charging.

🛠️ Technical Specifications
Min SDK: Android 8.0 (API 26)

Target SDK: Android 15 (API 35)

Architecture: Built with Kotlin + Jetpack Compose + Material 3

Storage: Local Room database (your data never leaves your device)

Recommendations: Local rule-based engine (no network, no AI)

Export: Universal CSV format (opens in Excel, Sheets, or any text editor)

Battery Health respects your privacy and your intelligence. No fake "battery repair" claims. No hidden subscriptions. Just honest, useful battery data.