Ampere

Contains adsIn-app purchases
4.5
282K 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
Apr 29, 2022

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
4.5
282K reviews
Mark Borrmann
April 17, 2022
Great App! Only needs 1 thing.. A log! Or at the very least I need to be able to see minium and maximum charge rates once it's fully charged.. I don't want to watch the device the entire time and if I look to late then the app goes blue and says fully charged and the maximum charge amps is gone.. so would be nice if the app outputted a text file or something with a log of minimum and maximum charge rates and discharge rates organized with date and time... If Ampre did that it would be perfect!
212 people found this review helpful
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Kyle Doering
May 3, 2022
This app is great and has been super helpful in monitoring my battery levels on my old Pixel 4XL and the wireless charging issue on my new Pixel 6pro. The only reason for 4 stars instead of 5 is because a charging history and charging curves showing how the charging draw of the phone would be incredibly helpful. Right now you can only see what the current amperage is.
35 people found this review helpful
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Rick Kross
February 11, 2022
I Loved this Functional App so much that I bought the Pro Version to support it. The only reason that I gave it 4 Stars is because, even though it gives you the option to show 3 things that you can display at the top in your drop down info bar, you CAN'T really display ALL 3 of the choices that it allows you, because it'll OVERCROWD the area in the BAR and CUT THEM OFF. Also if you test the Alarms in the settings Menu, the Alarm Icons STAY STUCK in your Info Bar without ANY WAY to CLEAR THEM?
83 people found this review helpful
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What's new

v3.55
* Preparations for Android 12
* 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