Where to find battery health information on Android

Android does not display battery health the way iPhones do. There is no single "battery health percentage" built into Settings on most Android phones. Instead, you will find scattered information across different places depending on your phone's manufacturer and Android version.

The most reliable built-in method is to dial *#*#4636#*#* on your phone's keypad. This opens the hidden diagnostic menu, sometimes called the Service Menu. Tap Battery information and you will see several readings: current temperature, voltage, and health status. The health field will show one of four states: Good, Cold, Dead, or Over voltage. If it says Good, your battery is functioning normally.

Not all phones support this code. If nothing happens when you dial it, your manufacturer has disabled this feature. Samsung, Google Pixel, and most other major brands do respond to it, but some carriers or regional variants may not.

Key Takeaways

  • The diagnostic code *#*#4636#*#* opens a hidden menu showing battery health status on most Android phones, though some manufacturers disable it.
  • Battery health readings of "Good" mean your battery is functioning normally; "Cold," "Dead," or "Over voltage" indicate a problem that may need service.
  • Battery temperature above 45°C (113°F) during normal use suggests a hardware or software issue worth investigating.
  • Checking battery voltage and cycle count requires third-party apps, since Android does not display these details in Settings.
  • If the diagnostic menu shows poor health or your phone overheats frequently, contact the manufacturer or a repair service rather than attempting a DIY fix.

What the diagnostic menu readings actually tell you

When you open the battery information screen, you will see several fields. The Health field is the most important one. "Good" means the battery is operating within normal parameters. "Cold" means the battery temperature is too low for safe operation—this usually clears once the phone warms up naturally. "Dead" means the battery cannot hold a charge and needs replacement. "Over voltage" is rare and indicates an electrical fault in the charging circuit.

The Temperature reading shows your battery's current heat in Celsius. Normal operation is between 15°C and 35°C (59°F to 95°F). If you see 40°C or higher during light use like texting or web browsing, something is wrong. During heavy use like gaming or video recording, temperatures up to 43°C are acceptable, but sustained heat above 45°C suggests a failing battery or a software process consuming too much power.

The Voltage field shows the battery's electrical output in millivolts. A healthy battery typically reads between 4000 and 4200 mV when fully charged. Voltage below 3000 mV indicates the battery is degraded and losing capacity. You do not need to memorize these numbers—if health says "Good," the voltage is fine.

Using third-party apps to see cycle count and capacity

The hidden diagnostic menu does not show cycle count (how many times the battery has charged and discharged) or maximum capacity (what percentage of its original charge it can now hold). For those details, you need a third-party app.

AccuBattery is the most widely used option. It tracks your charging patterns over time and estimates battery capacity as a percentage of the original. It also predicts how many charge cycles your battery has gone through. The app is free with optional paid features. read it from the Google Play Store, let it run for a few charging cycles, and it will show you a capacity estimate. A battery at 80% capacity or higher is considered healthy. Below 80% means the battery is degraded but still usable.

Battery Health Report is another option that shows similar information without requiring you to wait for multiple charge cycles. It gives you an when ready estimate based on your current battery behavior. Neither app is perfect—they estimate rather than measure directly—but they are more reliable than guessing based on how long your phone lasts.

Why your phone might show poor battery health

If the diagnostic menu shows "Cold," "Dead," or "Over voltage," or if temperature readings are consistently high, the problem is usually one of three things: a failing battery, a faulty charging port, or a software process running in the background.

A failing battery loses the ability to hold charge and may swell, making the phone feel warm even at rest. This is a hardware problem and requires replacement. Do not attempt to replace it yourself unless you have experience opening phones—lithium batteries can catch fire if punctured.

A faulty charging port can cause the phone to misread the battery voltage or temperature. If your phone charges slowly, charges only when the cable is held at a certain angle, or shows "Over voltage" in the diagnostic menu, the port may be damaged. This also requires professional service.

A software issue can cause high temperature readings without a hardware fault. A misbehaving app or a background process using the CPU constantly will heat the battery. Check your battery usage in Settings—go to Settings > Battery > Battery usage (the exact path varies by manufacturer) and look for apps using more than 5% of battery in standby mode. If you find one, uninstall it or clear its cache.

Steps to take if battery health is poor

If the diagnostic menu shows anything other than "Good," or if third-party apps show capacity below 70%, start by restarting your phone. A restart clears temporary software glitches that sometimes cause false readings.

Next, check for software updates. Go to Settings > About phone > Software update (or System update on Samsung). Manufacturers sometimes release patches that fix battery reporting errors or power-draining bugs. Install any available update and restart again.

If the phone still shows poor health after an update, and if it is overheating or draining quickly, contact the manufacturer's support line or visit an authorized repair center. Bring your phone and the diagnostic menu screenshot if possible. If your phone is still under warranty, battery replacement is usually covered. If it is out of warranty, replacement typically costs between $50 and $150 depending on the model.

Do not attempt to replace the battery yourself unless you are experienced with phone repair. Lithium batteries are fragile and can ignite if damaged during removal.

How often to check battery health

You do not need to check battery health constantly. A reasonable schedule is once every six months if your phone is a year old or newer, and once a month if it is older than two years. Most batteries degrade slowly—you will not see a sudden drop from "Good" to "Dead" in a week.

Check more frequently if you notice your phone draining faster than usual, running hot during normal use, or if the battery has visibly swollen (the back of the phone feels puffy or the screen is lifting). These are signs of imminent failure and warrant when ready service.

If you use your phone in very hot environments regularly—in a car in summer, for example—battery degradation will accelerate. In that case, checking every three months is reasonable.

Frequently Asked Questions

What does "Cold" battery health mean and is it dangerous?

"Cold" means the battery temperature has dropped below the safe operating range, usually because the phone was left in a cold environment. It is not dangerous. The battery will return to "Good" status once the phone warms up naturally—do not use a heat source like a microwave or oven. If the phone is at room temperature and still shows "Cold," there may be a temperature sensor fault, and you should contact the manufacturer.

Can I improve my battery health or make it last longer?

You cannot reverse battery degradation once it has occurred. However, you can slow future degradation by avoiding extreme temperatures, not leaving the phone plugged in overnight constantly, and closing apps that drain power in the background. Enabling Battery Saver mode in Settings also reduces strain on the battery during daily use.

Is it safe to use my phone if battery health is "Dead"?

A "Dead" reading means the battery cannot hold a charge reliably and should be replaced soon. The phone may shut down unexpectedly even when the battery percentage shows 20% or higher. Using it is safe in the short term, but you should arrange a replacement within a week or two to avoid data loss from sudden shutdowns.

Why does AccuBattery show a different capacity than the diagnostic menu?

The diagnostic menu shows voltage, which is one way to estimate health. AccuBattery estimates capacity based on how much charge the battery accepts and how fast it drains. Both are estimates, not direct measurements. Small differences between them are normal. If they differ by more than 10%, wait a few more charging cycles and check again.

Do I need to do anything special before checking battery health?

No. You can check battery health at any time, whether the phone is charging, fully charged, or low on battery. The readings will be most stable if you check when the phone has been idle for a few minutes, but it is not required. Avoid checking when ready after heavy use like gaming, since the battery will still be warm and temperature readings will be temporarily elevated.