Download Ampere for Android

Download Ampere for Android Have you ever felt that one set charger/USB cable charges your device very fast while the other one doesn't? Now, you can test that with Ampere.

Measure the charge and discharge current of the battery.

Ampere Features:

widgets
notice
Alerts on the device
Alerts on Android Wear

The app works on Android 4.0.3+ devices. Not all devices are supported because there are devices that lack an appropriate measurement chip (or interface) and may not be supported at all. Please read the list of unsupported phones at the end of the description.

The app is not designed to be accurate to mA. It is just to evaluate which charger/USB cable combo works best for you on the same device.

Run the app and wait for approx. 10 seconds ("Measurement" on the screen). After this time, the charging or discharging current will be displayed.

Current depends on many things:

- Charger (USB / AC / Wireless)

USB cable

- phone type

- Current tasks running

Screen brightness

- Wi-Fi status

- GPS status

Please do not use the readings in this app as concrete science. However, the readings are good enough to gauge how well multiple chargers and USB cables on the same device are performing relatively well.

If the app shows 0 mA all the time, use the "Old Measurement Method" setting option. You can force the app to use the old benchmarking interface, if your Lollipop device has at least one.

Unfortunately, some Samsung devices do not give correct (measured) values (like the S5), only the maximum charging current that is possible with the actual charger / USB cable configuration. This is a firmware issue.

General information: The application measures the charging / discharging current of the battery. If your phone is not connected to a charger, you will see the discharge current which is negative. If you connect a charger, the current supplied by the charger will be used to power your phone and the remaining power will be charged to the battery.

If your phone draws 300mA without a charger attached (-300mA to the screen), a 500mA charger will charge your battery at most with a current of 200mA (200mA to the screen).

Technical information: The displayed current is the average value of 50 measurements minus the 10 highest and 10 lowest values. The displayed current may be unstable, unstable, or even zero, which means that the Android system provides unstable values. Each company uses different types of batteries and other devices, which can make it difficult to get accurate results about your charger.

LiPo batteries do not draw maximum power for the entire time it takes to charge a phone. If your battery is almost fully charged, the charging current will be much lower due to the lower battery levels.

Diagram showing the stages of LiPo charging:

Dave's LiPo Charging Software (EEVBlog):

Supported phones/ROMs with Legacy Measurement Method turned on and correct Measurement Interface selected:

➤ HTC One M7 / M8

LG G3

Reported phones/ROMS not working with this app:

➤ Galaxy Grand Prime - fortuna3gdtv

➤ Galaxy Note2 - t03g, t03gchn, t03gchnduos, t03gcmcc, t03gctc, t03gcuduos

➤ Galaxy S3 - d2att, d2spr, d2vmu

➤ Galaxy Tab 4 7.0 - degas3g

➤ HTC Desire 510 - htc_a11ul8x26

➤ HTC One S (Vella), X (Enduro), XL (Avoid)