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About the application:

Did you ever felt, that one Charger/USB cable set charges your device really quick and the another not? Now, you can prove this with Ampere. Measure the charging and discharging current of your battery. 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 apk is not meant to be mA accurate. It is only awesome for evaluate which Charger/USB cable combo is working the best for you on the same device. The current depends on a lot of things: - Charger (USB/AC/Wireless) - USB cable - Smartphone kind - Current tasks running - Display brightness - WiFi state - GPS state Please don't use the readings on this apk as concrete science. However, the readings are awesome enough to relatively measure how different chargers and USB cables fair on the same device. ------------ Background details: The apk measures the charging/discharging current of the battery. If your smartphone 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 smartphone and the remaining power will be charged into the battery. If your smartphone 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). ---- Technical details: 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 device system provides unstable values. Every company uses various battery types and another hardware making it difficult to receive accurate results about your charger. ----