Ampere

Contains adsIn-app purchases
4.5
303K reviews
10M+
Downloads
Content rating
Everyone
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About this app

Did you ever felt, that one Charger/USB cable set charges your device really fast and the other not? Now, you can prove this with Ampere.

Measure the charging and discharging current of your battery.

PRO features:
- Widgets
- Notification
- Alerts on device
- Alerts on Android Wear

Not every device is supported because there are devices which lacks an appropriate measurement chip (or the interface) and they can not be supported at all. Please read the list of not supported phones at the end of the description.

The app is not meant to be mA accurate. It is only good for evaluate which Charger/USB cable combo is working the best for you on the same device.

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Please read also the FAQ: http://goo.gl/R8XgXX

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Start the app and wait ca. 10 seconds ("measuring" is on the display). After this time, the charging or discharging current will be shown.

The current depends on many things:
- Charger (USB/AC/Wireless)
- USB cable
- Phone type
- Current tasks running
- Display brightness
- WiFi state
- GPS state

Please don't use the readings on this app as concrete science. However, the readings are good enough to relatively measure how various chargers and USB cables fair on the same device.

If the app shows 0mA all the time, please use the settings option "Old measurement method". You can force the app with it to use the old measurement interface, if the Lollipop device has at least one.

Unfortunately some Samsung devices don't give correct (measured) values (e.g.: S5), just the maximum possible charging current with the actual USB cable/charger configuration. This is a firmware problem.

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Background info: The app measures the charging/discharging current of the battery. If your phone is not connected to a charger, you see the discharging current which is negative. If you connect a charger then the current what the charger gives will be used to supply your phone and the remaining power will be charged into the battery.

If your phone consumes 300 mA without a charger connected (-300mA on the display), then a 500 mA charger will charge your battery maximum with 200 mA current (200mA on display).

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Technical info: The displayed current is an average value from 50 measurements minus the 10 upper values and the 10 lower values. The displayed current can be shaky or unstable or even zero which means, that the Android system provides unstable values. Every company uses different battery types and other hardware making it difficult to get accurate results about your charger.

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LiPo batteries don't draw the maximum for the full time it takes to charge the phone. If your battery is charged almost full then the charging current will be much less as by lower battery levels.

- A graph explaining LiPo charge stages: http://batteryuniversity.com/_img/content/ion1.jpg
- Dave's (EEVBlog) LiPo Charging Tutorial: http://youtu.be/A6mKd5_-abk

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Phones/ROMS compatible only with "Old measurement method" switched on and selected the right "Measurement interface":
➤ HTC One M7 / M8
➤ LG G3

Phones/ROMS reported to be not working with this app:
➤ Galaxy Grand Prime - fortuna3gdtv
➤ Galaxy Note2 - t03g, t03gchn, t03gchnduos, t03gcmcc, t03gctc, t03gcuduos
➤ Galaxy S3 - d2att, d2spr, d2vmu
➤ Galaxy Tab4 7.0 - degas3g
➤ HTC Desire 510 - htc_a11ul8x26
➤ HTC One S (ville), X (endeavoru), XL (evita)
➤ HTC Sensation 4G - pyramid

Please do not give wrong rating, if your phone is one of the above. Not the app is wrong, but your phone does not support this kind of measurement yet.

If the app doesn't work on your device with pre-Lollipop Android version, then please read the first and the second posts in this XDA developer forum thread: http://goo.gl/pZqJg8 . Please post your problem with screenshots in the XDA thread.

Please read also the FAQ: http://goo.gl/R8XgXX
Updated on
Feb 18, 2024

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
This app may share these data types with third parties
Location, App activity and 2 others
No data collected
Learn more about how developers declare collection
Data is encrypted in transit
Data can’t be deleted

Ratings and reviews

4.5
291K reviews
Ryan Cote
February 28, 2024
Very useful app. This really helps identify battery drain issues or issues with slow charging. It allows you to see the battery drain or charge current in real time. I had an issue with my battery draining super fast and Android's battery usage was not helpful. Ampere allowed me to immediately see effect of turning certain things on and off. In no time I was able to diagnose that my work profile was at fault. I like the always on notification in the pro version which can show on the AOD.
20 people found this review helpful
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A Google user
January 9, 2020
i have finally been able to sort through all my chargers and cords and can see why my phone has had intermittent performance. While driving taxi, I use it for dispatch: running GPS, answering calls and using bluetooth at the same time. Some days it would drain even while plugged in to charge. this app has revealed the culprits quite easily. thanks. I have used this app for almost two years now, still use it all the time , it answers questions I cant ask anyone else. Thankyou.
43 people found this review helpful
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A Google user
December 15, 2018
Does what it says, can't confirm accuracy but seems to be on top of it. The time to measure is a little annoying, but really only when you're testing multiple cords/ adapters in quick succession for peak performance. Not to be misleading, the measurements are displayed quick enough to avoid any testing of patiences, as well as amps. My suggestion would be to include a feature enabling the user to label and record sets of data, so when performing tasks such as I had been doing it is easier to remember which cords or adapters had the peak (or desired) output. All in all, a great app I wish I'd found sooner, thanks developers!
72 people found this review helpful
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What's new

v4.15
* Cycle count for Android 14 devices added
* GDPR handling with Google UMP
* Bug fixes and minor enhancements

Ampere FAQ: http://goo.gl/R8XgXX

For more info please read the change history: Settings => About Ampere => Change history

Note: When ampere would stuck in "measuring" state (after a firmware upgrade) please clear Amperes's app cache.
1.) Open the "Android Settings app" => "Apps" => "Ampere"
2.) Clear all data under the "Storage" menu
3.) Restart Ampere