WattMeter: Battery & Charge

In-Depth Battery Energy Monitoring & Analysis

Have you ever wondered how many watts your 65W charger is actually delivering to your battery?

After a year of use, how many mAh of capacity has your phone's battery lost? WattMeter is a professional tool that helps you decode all power metrics on your Android device.

Unlike standard apps, WattMeter reads data directly from the power management chip (Fuel Gauge) to provide the most accurate battery health information from the internal circuit (battery side).

KEY FEATURES:
REAL-TIME POWER MONITORING

Accurately track Power (W), Current (mA), and Voltage (V) second by second.

Monitor Temperature (°C/°F) to protect your battery from overheating during fast charging.

Display detailed battery status right on your notification bar (Notification Service).

BATTERY HEALTH ANALYSIS

Self-learning Delta-mAh algorithm based on actual charge cycles to estimate your current maximum capacity.

Sliding Window convergence mechanism: Calculates the average of the last 100 charge cycles to provide the most accurate battery health figure, rather than relying on theoretical manufacturer specs.

Compare actual capacity with the original design capacity.

CHARGING CHARTS & CONSUMPTION HISTORY

Charging power history chart: Check if your charger maintains a stable output over time.

Track daily energy consumption (Wh) to see which apps or tasks are draining your battery the most.

Automatically store and manage data for up to 30 days.

STANDBY CHARGING MODE

Turn your phone into a professional "power meter" when placed on a charging stand.

Customize brightness and keep the screen on to monitor metrics without unlocking your device.

MODERN WIDGETS (MATERIAL 3)

Diverse widget system: Mini Monitor (quick tracking) and Power Bar.

Material You design automatically adapts to your wallpaper and system theme colors.

WHY CHOOSE WATTMETER?
Transparent & Accurate: We measure from the battery side. You will see the actual power loss (5-20%) due to heat and PMIC switching compared to external USB meters.

Ad-Free & Lightweight: Optimized with Kotlin & Jetpack Compose, the app is incredibly lightweight and consumes virtually no battery in the background.

Battery Protection: Helps you identify poor-quality chargers or cables that could degrade your battery lifespan.

Privacy-Focused: No sensitive permissions required, and no personal data is collected.

DEVELOPER'S TIP:
For the most accurate battery health measurement, perform charge cycles with a difference of more than 10% (e.g., charging from 20% to 80%). After about 10-20 charge cycles, the app will provide the most precise battery health indicator for your device.

Download WattMeter now and master your device's energy!