Ever felt that one USB charger / cable charges your device really fast and the other doesn't? Now, you can test this with Ampere. Measure the charge and discharge current of your battery. Not all devices are compatible because there are devices that lack an appropriate measurement chip (or interface) and cannot be compatible at all. Read the list of unsupported phones at the end of the description. Please do not use the readings in this app as concrete science. However, the readings are good enough to relatively measure how well multiple chargers and USB cables work on the same device. If the application shows 0 mA all the time, use the "Old measurement method" setting. You can force the app with it to use the measurement interface above, if the Lollipop device has at least one. Unfortunately, some Samsung devices do not provide correct (measured) values (ex: S5), only the maximum charge current possible with the actual USB cable / charger settings. This is a firmware problem.
Required Android Versions : Jelly Bean [4.1–4.3.1] - KitKat [4.4–4.4.4] - Lollipop [5.0–5.0.2] - Marshmallow [6.0 - 6.0.1] - Nougat [7.0 – 7.1.1] - Oreo [8.0-8.1]