Battery Level Logger

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"Does it feel like your phone's battery is draining faster lately?" "Want to check if a recent OS update is causing unusual power consumption?" "Battery Level Logger" is the perfect tool for these moments. No app installation is required. Simply keep this page open in your browser, and it will automatically record changes in your battery level over time.

Key Uses for This Tool

Battery Health Self-Diagnosis By tracking how quickly your battery drops from 100%, you can objectively determine if your battery has reached the end of its lifespan and needs replacement.

App & Task Power Consumption Research Identify "battery hogs" by logging usage during specific activities. For example, find out exactly what percentage is consumed by one hour of video streaming versus gaming.

Quality Check for Used Devices Perfect for verifying the battery performance of a secondhand smartphone or tablet. Run a log for a few hours to ensure the device holds a charge as expected.

Standby Drain Check (Overnight) Measure how much battery is lost while you sleep. This helps you discover unnecessary apps running in the background.

How to Use

Automatic Logging: Just Keep the Page Open As long as the page is active, your current battery percentage and the time of measurement will be automatically added to the log list.

Review Your History View a chronological list showing exactly what time your battery was at a specific percentage.

Resetting Data To start a new measurement, simply refresh the page or click the reset button (if available).