How to Use Ampere to Measure Your Android Device’s Charging and Discharging Current
If you ever wondered why some chargers or USB cables charge your Android device faster than others, you might want to use Ampere, a free app that can measure the charging and discharging current of your battery. Ampere can help you find out the optimal voltage you need to charge your battery safely and efficiently.
In this article, we will show you how to use Ampere to monitor your battery’s current and find out which charger or USB cable works best for you.
What is Ampere?
Ampere is an app developed by Brain_trapp that can measure the charging and discharging current of your Android device’s battery. It can also show you other information about your battery, such as its status, percentage, technology, temperature, model, device version, and IP address.
Ampere can be downloaded for free from the Google Play Store or from Uptodown. It has a 4.5-star rating and over 10 million downloads. It also offers some PRO features, such as widgets, notifications, and alerts on device or Android Wear, for a small fee.
How to Use Ampere?
Using Ampere is very simple. Just follow these steps:
Install and launch the app on your Android device.
Wait for about 10 seconds until the app displays “measuring” on the screen.
After this time, you will see the charging or discharging current of your battery in milliamps (mA).
If your device is not connected to a charger, you will see a negative value, which indicates how much current your device is consuming.
If your device is connected to a charger, you will see a positive value, which indicates how much current your charger is supplying to your device and battery.
The current value depends on many factors, such as the type of charger (USB/AC/Wireless), the quality of the USB cable, the phone model, the tasks running on the device, the display brightness, the WiFi state, and the GPS state.
Ampere is not meant to be mA accurate. It is only good for evaluating which charger or USB cable combo works best for you on the same device. The app also warns that not every device is supported because some devices lack an appropriate measurement chip or interface. You can check the list of not supported phones on the app’s FAQ page.
How to Interpret Ampere’s Results?
Ampere’s results can help you understand how your battery is being charged or discharged. Here are some tips on how to interpret them:
The higher the positive value, the faster your battery is being charged.
The lower the negative value, the slower your battery is being discharged.
To charge your battery at a normal rate, you need a difference of at least 200 mA between the charging and discharging current. For example, if your device consumes 300 mA without a charger connected (-300 mA on the display), then a 500 mA charger will charge your battery with 200 mA current (200 mA on display).
The less current you have, the less efficient the charging method. For example, if your device consumes 300 mA without a charger connected (-300 mA on display), then a 300 mA charger will not charge your battery at all (0 mA on display).
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 if the Android system provides unstable values.
Lithium-ion batteries do not draw the maximum current for the full time it takes to charge them. If your battery is almost full, then the charging current will be much less than when it is low. You can learn more about LiPo charge stages from this graph or this video.
Ampere is a useful app that can help you measure the charging and discharging current of your Android