Battery Train

Charging and discharging every single day—how long will your smartphone battery actually last?
Start your day right, completely free of battery anxiety.

Are you managing your battery the right way?

Smartphone batteries inevitably degrade with use.
However, it's hard to tell exactly when it started getting worse, or if its current condition is normal.
Battery Train automatically records every single moment of charging and discharging, allowing you to understand your battery status at a glance.

[Key Features]

▸ Continuous Battery Logging (Foreground Service)
The app utilizes a persistent Foreground Service to monitor and log your battery status accurately in real-time. This ensures that the Android system does not terminate the tracking process in the background, allowing your history to build up continuously without missing sudden battery drops, even when your phone is locked or asleep.

▸ History Graphs
Check your charging and discharging curves with 24-hour, 7-day, and 30-day graphs.
You can see at a glance exactly when your battery drops sharply.

▸ Battery Health Analysis
By analyzing the discharge rate, the app calculates a battery health score.
If your battery health is declining, you can prepare for a replacement in advance.

▸ Smart Charging Alerts
• Immediate alert when the battery drops below your set percentage (e.g., below 20%)
• Alert when reaching your target percentage during charging (e.g., unplug advice at 80%)
Prevent overcharging and deep discharging to extend your battery's lifespan.

▸ Dark Mode Support
Automatically switches between Dark Mode and Light Mode based on your system settings.

[Recommended For]
• Anyone who wants to extend their smartphone's lifespan
• Anyone curious about when their battery drains the most during the day
• Anyone who wants to know the perfect time for a battery replacement
• Anyone looking to fix their overcharging habits
• Anyone experiencing sudden and rapid battery drain

[What is Battery Health Score?]
Battery Train calculates a health score by analyzing your discharge rate over a certain period.
A higher score means your battery is in good condition, while a declining score suggests that battery aging is underway.

[Foreground Service & Notification Guide]
• Battery Train requires a continuous Foreground Service accompanied by an ongoing notification to perform real-time battery tracking. Because Android's aggressive battery optimization terminates standard background apps, this service is essential to guarantee uninterrupted data collection for your graphs and to trigger high-priority Smart Charging Alerts instantly.
• You can start or stop this background tracking service at any time within the app settings.

Start managing your battery right now.