Battery Health Log

Battery Health Log helps you understand how much your smartphone battery has degraded compared with its original capacity. Set the battery capacity published by your device manufacturer, then charge your phone to 100%. The app estimates the full-charge capacity using battery information provided by Android and calculates battery health as follows: Battery health = Capacity at 100% charge ÷ Original battery capacity × 100 Key Features • Battery health percentage • Estimated degradation percentage • Capacity at 100% charge compared with the original capacity • Date and time of the latest full-charge measurement • Long-term battery health graph • Detailed measurement history • Charging-session records • Battery temperature, voltage, current, and charging status • Device compatibility check with an explanation • Suggested nominal capacity based on the device model • Optional high-temperature notifications • Automatic removal of measurements that are too short or appear abnormal How to Measure 1. Enter your device’s original battery capacity in Settings. 2. Enable periodic measurement. 3. Charge your device to 100%. 4. Open the app to check the recorded capacity and battery health. If no measurement is recorded, open the app while the battery is at 100% and tap “Measure again.” Privacy Measurement history and settings are stored only on your device. The current version does not require an account or send battery data to an external server. Important Information Available battery information differs depending on the device manufacturer, model, and Android version. Some devices do not provide the capacity information required for measurement. Battery Saver, Doze, force stopping the app, and manufacturer-specific background restrictions may delay or prevent measurements. Measurement intervals and successful recording at 100% cannot be guaranteed. Battery health and degradation values are estimates based on information provided by the device. They are not manufacturer test results, repair assessments, warranties, or professional diagnostics. If your battery is swollen, unusually hot, or produces an unusual smell, stop using and charging the device immediately and contact the manufacturer or an authorized repair provider. Developed by nGrid Co.,Ltd. Production location: Fukuoka, Japan