Is your phone dead by mid-afternoon, even after charging it overnight? Before blaming the phone, find out where the charge goes. Most of the time it is an app that keeps working in the background, a screen set too bright, or a battery that has simply aged.
A phone battery app helps you keep track of your battery. None of the battery apps we checked is available on both stores, so this guide gives one suggestion per device: AccuBattery for Android and Battery Life for iPhone, each described by what it actually shows.
One thing to know before you install either: neither adds capacity or makes a battery last twice as long. What stretches a charge is a short list of system settings, covered further down.
6 min read
📋 What you’ll find here
- Where your phone’s charge actually goes
- Why this guide suggests one app per device
- AccuBattery on Android: wear, capacity and the hungriest apps
- Battery Life on iPhone: levels, runtimes and accessories
- Can an app make your battery last twice as long?
- Five settings that make a charge last longer
Pick the suggestion for your device 👇
For Android — suggestion: AccuBattery
For iPhone (iOS) — suggestion: Battery Life – check runtimes
Key Takeaways
- One suggestion per device: AccuBattery is Android only, Battery Life is iPhone only.
- Both apps measure and alert; neither adds capacity or doubles battery life.
- Brightness, background apps, battery saver and location settings are what save charge.
- A worn battery is fixed by a replacement, not by an app.
Where your phone’s charge actually goes
The screen is usually the biggest single drain. High brightness and a display that stays on for long stretches empty a battery faster than most apps do.
Next come apps that keep running in the background, location services that never switch off, and a weak signal, which makes the phone work harder to stay connected. Heat speeds all of it up.
Then there is age. Every battery loses capacity as it goes through charge cycles, so a phone that is two or three years old holds less energy than it did new, even with the same habits.
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Why this guide suggests one app per device
AccuBattery, with more than 10 million downloads, is only on Google Play: its developer, Digibites, links to no other store from its site. Battery Life, by RBT Digital, is built for iPhone, iPad and Apple Watch and is only on the App Store.
So instead of forcing one app onto both phones, this guide gives a suggestion per device, each described from its own store listing. The buttons near the top of the page open the right store for each system.
Watch out for lookalikes. An app called AccuBattery – Battery Info on the App Store comes from a different developer and has a 2.1 rating from 7 reviews on the US store. It is not the Android app.
AccuBattery on Android: wear, capacity and the hungriest apps
AccuBattery estimates how much charge your battery really holds, in mAh, from measurements taken on your own phone, and tracks how much it wears with each charge cycle. That number tells you whether the battery still holds what it did when new.
It also breaks down battery use by app, which is how you find the culprit, and it has a charge alarm designed to reduce battery wear. A history of charge and discharge cycles stays in the app.
It is rated 4.7 on Google Play from 608,000 reviews, with more than 10 million downloads. It is free to download, shows ads and has in-app purchases; the Pro version removes the ads.
- Best for: seeing how worn your battery is and which app uses the most.
Battery Life on iPhone: levels, runtimes and accessories
Battery Life shows your iPhone’s charge level, whether it is charging and whether Low Power Mode is on. It also estimates how long the remaining charge lasts for video, audio and web browsing, based on the figures Apple publishes for your model.
It does not measure capacity on its own. Instead, it walks you step by step to the battery health and maximum capacity that iOS itself measures. It also gathers the battery levels of an Apple Watch, AirPods and other accessories in widgets and on the watch face, and alerts you when one falls below a level you choose.
Widgets and alerts refresh on the system’s schedule, usually every 5 to 60 minutes, so they are not live readings. The app is rated 4.6 on the US App Store from nearly 34,000 ratings. It is free to download with ads; Pro, a one-time purchase of $1.99 in the US, removes them.
- Best for: keeping an eye on the iPhone and its accessories in one place.
- What it doesn’t do: list battery use per app, which on an iPhone is in Settings, under Battery, or stretch the battery.
Can an app make your battery last twice as long?
If you arrived here after reading that you can save 6 hours of battery in 30 seconds, or that an app makes a battery last twice as long, this is the section that matters.
A battery app measures and alerts. It does not add capacity, undo wear or change anything inside the battery. Neither store listing promises extra hours, and those figures appear in neither of them.
| The claim | What actually happens |
|---|---|
| Save 6 hours in 30 seconds | Neither AccuBattery nor Battery Life promises extra hours |
| The battery lasts 2x longer | No app adds capacity; system settings are what stretch a charge |
| An app that boosts the battery | Battery apps measure and alert; the battery itself stays the same |
| An old battery like new | Wear is permanent; a replacement is the fix |
Five settings that make a charge last longer
Once you know the culprit, from AccuBattery on Android or from the Battery screen in iPhone Settings, the fix is usually in your phone’s settings, at no cost. Change one thing at a time and give it a full day before changing the next.
Menu names vary between phone makers, but these five exist on both systems:
- Brightness: turn on auto-brightness and shorten the time before the screen turns off.
- Background activity: restrict the hungriest app in Android’s battery settings, or turn off Background App Refresh for it on iPhone.
- Battery saver: Battery Saver on Android, Low Power Mode on iPhone.
- Location: set apps that don’t need it all the time to while using the app.
- Weak signal: where there is no coverage, airplane mode stops the phone from searching for a network.
When the battery itself is worn out
If AccuBattery shows a capacity well below the original, or your iPhone reports low battery health, no setting brings the lost capacity back. The battery has aged, and the fix is a replacement.
Use an authorized or trusted repair shop that fits a quality part. A battery of unknown origin can last less than the old one and run hotter than it should.
Which one to install, and what to expect
On Android, keep AccuBattery installed for a few days of normal use and see which apps top the list. On iPhone, follow Battery Life’s guide to the battery health screen and watch the charge from its widgets.
Either way, the gain comes from what you change afterwards: brightness, background activity and location. The app shows the battery’s state; the settings do the saving.
This article is informative and independent. We have no connection with Digibites, RBT Digital LLC, Google or Apple. Store details were checked on October 19, 2026, and may change. We are not responsible for the apps’ readings, for store charges or for changes made to your phone based on this guide.
FAQ
Is there an app that doubles battery life?
No. Battery apps show your charge, wear or use and alert you, but none adds capacity. What stretches a charge is your phone’s own settings.
Is AccuBattery available for iPhone?
No. Digibites makes AccuBattery for Android only. The app with a similar name on the App Store is from another developer. On iPhone, this guide suggests Battery Life.
Does Battery Life work on Android?
No. RBT Digital presents it as an app for iPhone, iPad and Apple Watch, and its site links only to the App Store.
Are these apps free?
Both are free to download and show ads. In both, a paid Pro version removes the ads.
Is there another option for Android?
Battery Guru, by Paget96, is also Android only and shows battery health and the apps that drain the most. Its developer presents it as a monitoring tool and makes no promise to stretch the battery.
