How to measure battery health on Android and when it's worth replacing it

If you've recently noticed that your mobile phone It shuts down prematurelyIf it gets too hot or you're constantly plugged into the charger, it's normal to wonder how the battery really is. Battery health on Android is one of those key pieces of information that we almost never see at a glance.But it determines whether the phone will continue to perform well or if it's time to think about changing the battery... or the phone.

Even if everything seems fine as long as it shows 100% when plugged in, the actual capacity of the battery It decreases with charging cycles, the passage of time, temperature, and the type of use.This article provides a comprehensive guide to understanding battery health, how to measure it on Android with and without apps, what brands like Samsung and Xiaomi offer, how to compare it to iPhones, when it's worth replacing it, and what tricks actually work to extend its lifespan.

Health vs. Autonomy: What do they really mean?

When we talk about battery we usually only think about how many hours it lasts, but Battery "health" is a different concept from everyday autonomyHealth reflects how much the phone has degraded compared to when it was new, usually expressed as a percentage of its original capacity.

A brand new battery is 100% healthy and can deliver its full designed capacity (for example, 4.000 mAh actual capacity if that was the manufacturer's specificationWith use, the internal materials deteriorate, and that same battery may only be able to store 3.600 mAh; even if the phone shows 100% charge, the actual health would be around 90%.

Current Android mobile phone batteries are lithium ions or lithium polymerThey are designed to withstand between 300 and 500 full charge cycles before capacity loss becomes noticeable. A full cycle, simply put, is equivalent to charging from 0% to 100% once, although in practice the system adds up percentages: two 50% charges would count as one cycle.

Therefore, Battery health is the indicator that tells you if there is still some life left or if the cell is already "asking for retirement".It affects how long the charge lasts, the stability of the device, and the likelihood that it will start to shut down on its own or suffer overheating problems.

Battery life cycle: How long does it really last?

Once you get a new mobile phone, the battery countdown inevitably begins. Each time you start a charging cycle below a certain percentage (around 70%), you add wear and tear.If you're someone who charges their phone daily, you'll easily accumulate around 300-360 cycles in a year.

Many analyses of lithium batteries agree that From the 300-500 cycle range onwards, the useful capacity begins to decrease noticeably.This translates into fewer screen hours, more frequent charging, and a degradation that accelerates the more you use the phone: as it lasts less time, you charge it more, and you enter a vicious cycle.

Still, cycle figures are indicativeFactors that influence battery quality include cell quality, mAh capacity, internal phone design, operating system management, and how you use it: it's not the same for someone who plays games and streams for hours a day as for someone who only chats and browses for a while.

Manufacturers are aware of this and have incorporated safeguards: The phone turns off before reaching 0% battery to avoid damaging the battery.And when you leave it charging all night, the system limits the current when it reaches 100% and usually keeps the charge within a certain safe range so as not to constantly "force" the cell.

No matter how well you take care of it, The battery will always lose capacity over the years.What you can do is monitor their health, adapt some habits, and decide in time if it's worth changing it.

How to check the battery health and cycles on Xiaomi: Complete updated guide

What exactly is battery health on Android?

How and why your mobile phone battery degrades

How to view battery health on Android from settings

For a long time, Android as a system did not offer clear battery health data in the settings. In many layers you could only see the current percentage, usage by app, and some estimate of remaining timebut nothing about maximum capacity or charging cycles.

With recent versions of the system, things have started to change. In Android 14 and later, Google introduced APIs that allow reading data such as load cycles and estimated capacity.and some manufacturers are taking advantage of this to display a specific "Battery Status" section.

On mobile phones with very new versions (and especially in Android 16 (when more models become available), you'll be able to find an option like this:

Open Settings on your Android phone.
Enter the section Battery.
Look for a submenu called something like Battery status or similar.
Inside you will see some information about “Battery capacity” or “Maximum capacity” expressed as a percentage with respect to when it was new.

That percentage indicates, approximately, the maximum charge that the battery is capable of storing compared to a new batteryIf you see values close to 100%, you're practically back to square one; if it drops below 80%, the wear and tear is already noticeable.

The problem is that Not all mobile phones have received these options yet.And many models with older versions of Android still don't display this information. In those cases, you have to resort to other methods: hidden menus or third-party applications.

Hidden menu and secret codes to view battery level on Android

For years, Android has had an internal testing menu that can be accessed with a code from the phone app. This menu may display a "Battery Information" section with details such as status, voltage, or temperatureHowever, availability depends heavily on the manufacturer and the operator.

To test If your mobile phone supports it, you can do the following:

Open the phone app as if you were going to make a call.
Dial the code * # * # * # * # 4636 (In some texts you will see #*#4636#*# written by mistake, but the standard valid version is the first one).
Entering the last symbol should automatically open a “Tests” or “Testing” menu.
Find the section “Battery information”.

In that section, if your device supports it, you will see several fields: current battery level, health status (Good/OK/Bad), voltage, temperature, battery type, or date of last full chargeThe key data is usually "Health" or "Battery status", with values such as "Good", "Normal" or "Poor".

Yes, This code does not work on all manufacturers or all versions of AndroidSome have removed or limited this menu, so if nothing happens when you select it, you'll have to use another method. And even if it works, you'll often only see a very generic status, not a precise health percentage.

How to check battery health on Samsung Galaxy (Samsung Members)

Samsung is one of the brands that has made the most progress in this area, including its own diagnostic tools. In the Galaxy with One UI You can check the battery health from the Samsung Members app., which usually comes pre-installed.

El usual process It would be something like this:

Opens Settings and enters Battery and device care.
Inside, locate the section "Diagnosis" or “Diagnostics”.
Tap on “Phone Diagnostics”Samsung Members will open with a test panel.
Choose the option “Battery status”.

After a few seconds, the tool will show you a rating of the component, usually with a label like this: “Good”, “Normal” or “Weak”In some models it also indicates charging capacity and whether the battery is considered to be functioning within expected parameters.

Although Samsung doesn't always display a health percentage in the Apple style, This official review is quite reliable in determining whether the battery is still performing well or if it should be replaced.If you see "Weak" or equivalent, it's a clear indication that the wear and tear is significant.

How to view battery health and cycles on Xiaomi (MIUI / HyperOS)

In Xiaomi, Redmi and Poco mobile phones, the brand has been expanding the battery-related options in its latest layers. In recent versions of HyperOS A specific section called “Battery Information” has been added with very interesting data.

If your Xiaomi has the suitable versionThe path would be similar to this:

Sign in Settings of the System.
Access the menu Battery.
Look for the option “Battery protection”.
Inside you should see a section “Battery Information” with percentage of health, temperature and daily cycles.

For models that don't yet have that feature, Xiaomi offers another interesting trick: a brand-specific diagnostic codeIf you want to try it:

Open the calling app.
Dial the code * # * # * # * # 6485.
A screen will open with many fields (MB_00, MB_01, etc.).
Pay special attention to the field MB_06, which indicates the battery status.

The classification offered by this menu is usually similar to the one used by Samsung: Above a certain value it is considered good, in an intermediate range "fair" and below a certain threshold as badIt's a useful reference for deciding if it's time to take your vehicle to a repair shop.

Apps to measure battery health on Android

Although more and more data is becoming accessible from the system itself, The most flexible and detailed way to measure battery health on Android is still through third-party applicationsHowever, it's best to steer clear of those that promise miracles and focus on serious monitoring tools.

Among the most recommended are some such as AccuBattery, DevCheck, CPU-Z, Droid Info, AIDA64 or ElectronThey all specialize in displaying technical information about the hardware or offering advanced usage and load statistics.

With these types of apps you can see things like actual estimated capacity in mAh versus design capacity, number of cycles recorded since you installed the application, temperature, charging and discharging speed, voltage or the health status reported by the system (Good, Fair, etc.).

However, it is important to understand one limitation: If the app calculates cycles or health from the moment you install it, all previous phone usage is not taken into account.Therefore, the data for the first few days may not be representative; you need several complete cycles for the estimate to be reliable.

AccuBattery: a reference for estimating battery health

AccuBattery is probably the most popular app for this purpose. Its strength lies in its continuous monitoring of charging and discharging cycles to estimate the battery's actual capacity., and then compares it with the factory capacity that you specify when configuring it.

Once installed from Google Play, these are the basic steps:

Open the app and configure the design capacity of your battery (in mAh), which you can find in your mobile phone's technical specifications.
Use the phone normally for several days, allowing it to charge and discharge.
In the "Health" You will see the current estimated capacity and a calculated health percentage.

If, for example, your mobile phone has a 5.000 mAh battery and AccuBattery estimates that it can only store about 4.000 mAhYou'll know you've lost about 20% of capacity, even though the system still shows 100% when you reach the limit.

In addition to health, AccuBattery records statistics such as wear per charging session, maximum temperatures, screen-on time, and power consumption per applicationIt also offers alerts to disconnect the charger when you reach a certain percentage (for example, 80%) to reduce stress on the battery.

Other useful apps: DevCheck, CPU-Z, Droid Info, AIDA64, Electron…

Beyond AccuBattery, there are several applications designed to display hardware information that can also be used to check the battery. DevCheck, CPU-Z, Droid Info, and AIDA64 are some of the most used. by advanced users to check all the phone's sensors.

In most of these cases, simply install the app from Google Play, open it, and Go to the “Battery” tabThis usually displays information such as cell type, current level, temperature, voltage, and, if the manufacturer allows it, health status.

For instance, CPU-Z displays a "Health" entry within the battery sectionIf it says “Good,” it means that, according to the manufacturer's parameters and the number of recorded cycles, the battery is considered to be in good condition. However, if your brand does not provide this data to the system, the field may appear empty.

AIDA64 or Droid Info are usually more complete on some devices, showing theoretical capacity, measured capacity, estimated health percentage, real-time temperature, and discharge rateAgain, much will depend on what the manufacturer has decided to make available.

Electron and similar apps opt for a more modern and clear design, focused on displaying easy-to-interpret graphs and statisticsWhile they may not provide as much raw data as others, they can be ideal if you just want a quick overview of wear and tear.

Apps that are best avoided to "improve" battery life

The app store is full of so-called "battery optimizers" that promise miracles: double the autonomy, rejuvenate old batteries or “repair damaged cells”The reality is that the vast majority do none of that.

These types of apps are usually limited to Activate aggressive power-saving modes, close background processes, or reduce brightness and connectionsThese are all features that come standard in most Android interfaces and that you can manage from the phone's settings.

Tools like Kaspersky Battery Saver or Avira Battery Optimizer They focus on providing recommendations for reducing power consumption, monitoring the load on the lock screen, or forcing the closure of apps that use too much battery. They can be useful for keeping everything at hand, but They won't "cure" a degraded battery nor to recover lost capacity.

Also, keep in mind that Some of these apps request excessive permissions or display too much advertising.This can worsen the experience and even drain more battery than they claim to save. It's better to focus on reliable diagnostic tools and use the power-saving options included by the manufacturer.

How to know how many charge cycles your battery has

Charging cycles are one of the key references for lifespan. In general, a mobile phone battery is considered to be at the end of its useful life when it has lost around 20% of its capacity., and it usually coincides with those 300-500 cycles we mentioned.

In recent versions, Android has started to expose the number of cycles at the system level. With Android 14 and higher, some apps already take advantage of this feature to directly show you how many cycles the battery has recorded.This is especially useful if you buy a second-hand phone.

Meanwhile, on mobile devices with older versions, Applications can only start counting cycles from the moment you install them.In other words, if you've been using your mobile phone for two years and you install an app today, those two years of use "don't exist" for the app's counter.

Even so, knowing how many new cycles have been recorded since a specific point allows you estimate the rate at which you are draining the batteryIf you accumulate many cycles in a few months, you'll know that your usage rate is demanding and that the battery will suffer more in the long run.

As a general guideline, most modern mobile phones are designed to withstand between 300 and 500 cycles with acceptable capacitySome manufacturers, such as Samsung in high-end ranges, even mention a minimum of 2.000 cycles under certain conditions, although in practice daily use begins to suffer much sooner.

Signs your Android battery is failing

Beyond the numbers, your own daily use will give you clues. There are certain classic symptoms that reveal a faulty battery even if the system doesn't display any warnings.:

Fast drainageThe battery drains very quickly even with light use.
Random shutdownsThe phone turns off by itself with 20-30% charge or more.
OverheatingIt gets too hot during simple tasks or when charging.
Charger dependencyYou practically can't use it unplugged for very long.
Swelling: the back cover bulges or the screen appears to lift up.

If you detect one or more of these behaviors, It is quite likely that the battery has lost a good part of its health.In milder cases, you can manage with power saving modes or a power bank; if you see swelling or excessive heat, there is a real risk to the device and it is advisable to stop using it and consult a technician.

When is it worth changing your mobile phone battery?

The big question arises when you see that the health percentage has dropped or when the mobile phone doesn't last the day. Not every time your health deteriorates do you have to rush to change your battery.But there are certain reasonable thresholds.

In general, it is considered that A battery below 80% health has already lost a significant amount of autonomy.From then on, usage becomes inconvenient: you have to charge more times a day, and any demanding task is immediately noticeable in the battery bar.

If diagnostic apps, the manufacturer's menu, or the system itself indicate values around 70% or less, The most practical solution is usually to consider a battery replacement.That doesn't mean the phone will suddenly stop turning on, but the experience will gradually degrade.

Other factors also play a role: The cost of the battery versus the price of the phone, the age of the device, the difficulty of opening it, and whether you're still receiving security updates.In some cases, changing the battery perfectly extends the lifespan by a couple more years; in others, it may no longer be worthwhile.

The best course of action, unless you have experience opening mobile phones, is go to the official technical service or a trusted specialized workshopThey will use quality compatible batteries and appropriate tools, which is especially important for models with sealed bodies, strong adhesives, and the risk of damaging the screen or connectors.

Is it a good idea to change the battery yourself?

It depends a lot on the type of mobile phone you have. In the few models that still offer removable batteries, the change is as simple as turning off the phone, removing the back cover, and replacing the cell. for another original or of equivalent quality.

However, most current phones have the battery integrated into the chassis, sealed with adhesive and protected by screws, flex cables and delicate components. Opening them requires some skill, specific tools, and knowing exactly what you're doing..

If you lack experience, you're likely to damage the screen, a connecting ribbon cable, or even puncture the battery itself, with all the dangers that entails. Therefore, If you're not entirely sure and haven't followed a very detailed guide for your specific model, it's best to leave it to a professional..

Official technical services also usually use certified original batteriesThis ensures that the performance will be similar to the factory settings. In expensive devices, this peace of mind is often worth the investment compared to lower-quality solutions.

Real tips to extend battery life

Since we cannot prevent the battery from degrading, the goal is to do it as slowly as possible. Some habits have quite an impact in long-term health, while others are more secondaryThese are the most recommended:

Avoid extreme loadsTo minimize battery drain, it's best to keep your battery between 20% and 80%. Reaching 100% occasionally is fine, but trying to maintain that range helps.
Don't push it to 0% if you can avoid it.Letting your phone turn off due to a low battery on a regular basis adds unnecessary stress to the cell.
Control the temperatureHeat is one of the biggest enemies. Avoid leaving your phone in the sun, inside the car, or using demanding games while charging.
Use original or certified chargersThis ensures that the power and voltage are suitable for your device.
Take advantage of smart charging modesMany brands limit charging to 80% if you activate it, or adjust the speed at night to avoid keeping the battery at 100% for hours.
Disable features you don't useWiFi, Bluetooth, GPS, mobile data, or NFC consume power, especially if they are constantly searching for networks.
Adjust screen and brightnessThe screen is the biggest power hog. Reducing brightness and screen-off time helps both daily battery life and the number of charge cycles in the long run.
Control background appsSocial media, messaging apps, browsers, and games can consume resources even when you're not actively using them. Limiting background permissions reduces this constant drain.

It is worth remembering that Some of these practices sacrifice comfortIf you always charge your phone between 40% and 80%, you'll have to plug it in more often, which can be a hassle. Ultimately, it's about finding the balance that works best for you: enjoying your phone now or maximizing battery life.

Common battery myths that need clarifying

There are a lot of myths surrounding batteries, inherited from older technologies. One of the most repeated warnings is that it's bad to leave your phone charging all night.In most current phones, the system itself stops charging when it reaches a certain level and only makes small, occasional recharges to maintain the percentage.

There is also a lot of talk about calibrate battery letting it download to 0% and then charging to 100%This made sense in nickel batteries, but in lithium batteries it is not necessary for their health; at most it can help the system adjust the indicator reading better, but doing it regularly is even counterproductive.

Another classic is the idea that Activating airplane mode makes your phone charge fasterIn reality, what happens is that, by consuming fewer resources (data, calls, WiFi), there is less energy consumption while charging, so it seems to charge faster, but the charging power is still the one indicated by the charger.

It is also heard that Charging your phone while it's on or while you're using it will damage it.What really damages the battery is not that it's on, but the excessive heat: if you play something very demanding while charging with fast charging, the temperature rises too much; if it's simply on in standby mode, it's not a major problem.

Ultimately, The key is to avoid heat, continuous charging extremes, and poor-quality chargers.The rest are minor details compared to the normal wear and tear the battery will suffer from everyday use.

Ultimately, knowing how to measure battery health on Android, understanding what capacity percentages mean, taking advantage of tools from manufacturers like Samsung or Xiaomi, and relying on reliable apps like AccuBattery or DevCheck allows you to make informed decisions: you'll know if your phone simply needs some usage adjustments to regain their autonomywhether it's worth replacing the battery to give it a second life, or if it's time to think about a new device.