If your Android device’s battery seems to drain faster than it used to, it’s not just your imagination — batteries lose capacity over time. But instead of guessing when it’s time for a replacement, you can use Termux to track battery health and performance trends over days, weeks, or months. This guide will walk you through the process step-by-step so you can make data-driven decisions about your device’s battery life.

Why Monitor Battery Health?

Most people only realize their battery is failing when it can’t last through the day. By that time, performance might have already dropped significantly. Monitoring battery health over time helps you:

• Identify gradual capacity loss before it becomes critical.
• Spot charging issues or overheating patterns.
• Plan ahead for battery replacement instead of reacting last-minute.
• Understand how your charging habits affect long-term health.

Just like tracking security threats helps prevent cyber incidents, tracking battery health can prevent sudden device failures that might affect your productivity.

Getting Started with Termux

If you haven’t installed Termux yet, follow this Termux installation guide. Once installed, you can use built-in commands and small scripts to gather and store battery data over time.

Installing Required Packages

We’ll use basic Linux utilities available in Termux to log battery status:

pkg update && pkg upgrade -y
pkg install termux-api
pkg install coreutils

The termux-api package allows you to access Android’s battery info directly from Termux, while coreutils gives you common Unix tools for logging and formatting data.

Checking Battery Info in Termux

Termux can display battery details with a single command:

termux-battery-status

This will return data like:

{
  "health": "GOOD",
  "percentage": 85,
  "temperature": 32.3,
  "status": "CHARGING"
}

You can track this manually, but for long-term monitoring, we’ll automate it.

Logging Battery Health Over Time

We can create a simple script to log battery data every hour. Create a file named battery_logger.sh:

#!/bin/bash
while true
do
  termux-battery-status >> ~/battery_log.txt
  sleep 3600
done

Make it executable:

chmod +x battery_logger.sh

Run the script in the background:

./battery_logger.sh &

Now, Termux will log your battery’s percentage, temperature, and health every hour in battery_log.txt.

Analyzing Battery Trends

After running your logger for a few days or weeks, you can analyze the data:

grep "percentage" battery_log.txt | cut -d ':' -f2 | sort -n

This lets you see the battery percentage changes over time. If you notice consistent drops or overheating, it’s time to review your usage or consider a replacement.

Think of this like network security monitoring — the sooner you spot abnormal behavior, the faster you can respond.

Adding Temperature and Health Tracking

Battery temperature is critical. High temperatures can accelerate wear and, in rare cases, cause safety risks. To check the highest recorded temperature in your logs:

grep "temperature" battery_log.txt | cut -d ':' -f2 | sort -nr | head -1

If you see regular spikes above 40°C, you should adjust charging habits or avoid heavy gaming during charging.

Automating Reports

If you want daily or weekly summaries, you can use cron-like scheduling in Termux. Although Termux doesn’t have cron by default, you can set up task scheduling with termux-job-scheduler or use scripts that run at boot. This is similar to other Termux automation projects where tasks run without your manual input.

Using VPNs While Remote Logging

If you plan to send your battery logs to a remote server for backup, always secure the connection. Public Wi-Fi can be risky, so using a VPN like Surfshark or other recommended VPNs for Termux is a good idea.

When to Replace Your Battery

While Android doesn’t directly show battery capacity loss in percentage like laptops, you can tell it’s time to replace the battery when:

• Capacity drops significantly within a short time after charging.
• Battery percentage jumps unexpectedly.
• Device shuts down at 20-30% charge.
• Heat levels are consistently high during light usage.

These patterns are similar to identifying risks in small business cybersecurity — once you see the warning signs, act before failure happens.

Final Thoughts

Monitoring battery health in Termux is straightforward and can save you from unexpected downtime. With just a few commands and a simple script, you can log, analyze, and even automate reports to keep your device running at its best.

Just like creating a cybersecurity plan prevents data loss, a battery health monitoring plan prevents productivity loss. Whether you’re using your device for personal tasks or business-critical operations, keeping the battery in top condition ensures you stay connected when it matters most.