Have you ever thought that one set of charger / USB cables would charge your device really fast and the other would not? Now you can prove it with Ampere.

Measure the charge and discharge current of your battery.

Ampere PRO Features:

– Widgets
– Notification
– Alerts on the device
– Alerts on Android Wear

Not all devices are supported because some devices do not have a suitable measurement chip (or interface) and therefore cannot be supported. Please read the list of unsupported phones at the end of the description.

Ampere is not meant to be accurate in mA. It is only used to assess which charger / USB cable combo works best for the same device.

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

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Launch Ampere and wait for this. 10 seconds (“measurement” is displayed). After this time, the charge or discharge current is displayed.

The current depends on a lot of things:

– Charger (USB / AC / wireless)
– USB cable
– Phone type
– Running tasks
– screen brightness
– WiFi status
– GPS status

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

If the app displays 0mA all the time, please use the “Old measurement method” setting option. 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 do not provide the correct (measured) values ​​(for example: S5), only the maximum charging current possible with the current configuration of the USB cable / charger. This is a firmware issue.

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General information:

the application measures the charge / discharge current of the battery. If your phone is not connected to a charger, the discharge current is negative. If your phone consumes 300mA without a charger connected (-300mA on screen), a 500mA charger will charge your battery to the maximum with 200mA current (200mA on screen).

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Technical info:

The current displayed is an average value of 50 measurements minus the 10 upper values ​​and the 10 lower values. The current displayed may be unstable or unstable or even zero, which means that the Android system is providing unstable values. Each company uses different types of batteries and other hardware, making it difficult to get accurate results for your charger.

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LiPo batteries do not consume the maximum during all the time needed to charge the phone.

– A graphic explaining the LiPo charging steps: http://batteryuniversity.com/_img/content/ion1.jpg
– Dave LiPo Loading Tutorial (EEVBlog): http://youtu.be/A6mKd5_-abk

Phones / ROMs reported not working with this app:

Galaxy grand prime – fortuna3gdtv
+ Galaxy Note2 – t03g, t03gchn, t03gchnduos, t03gcmcc, t03gctc, t03gcuduos
+ And Galaxy S3 – d2att, d2spr, d2vmu
Galaxy Tab4 7.0 – degas3g
HTC Desire 510 – htc_a11ul8x26
HTC One S (city), X (attempt), XL (evita)
+And HTC Sensation 4G – pyramid

Please do not give a bad rating, if your phone is one of the above. The app is not bad, but your phone does not yet support this type of measurement.

If the app does not work on your device with the Android version prior to Lollipop, please read the first and second posts in this XDA Developer Forum thread: http://goo.gl/pZqJg8. Please post your issue with screenshots in the XDA thread.

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