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How can the battery get discharged while Ampere is showing that it is charging?

Example:

At 1:06 PM, the battery indicates 2%.

At 1:08 PM, the battery indicates 1%, even though Ampere says that the min mA was strictly positive (40 mA).

How is that possible?

I use Android 10 on Samsung Galaxy S9.

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    Consumption is higher. Try AccuBattery app. It shows realtime (whatever that means) reduction of charge from the battery in a sticky notification. If that is higher than what is reported in Ampere, you have a net reduction in battery charge even during charging. Most likely, USB cable or charger or the usb port of your device is faulty.
    – Firelord
    Jan 16 at 0:09
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    You didn't say what your device was doing at the time, apart from charging, or how much your AC charger is "giving". As for consumption, see my oder answer here for some example values. If you eg record a HD video, stream it live while having the display on full brightness, that means about 4W being consumed. Having an USB2.0 charger connected, you'd only get about 2.5W in (500mA at 5V) – and thus would consume 1.5W more than you feed. Just to give an example.
    – Izzy
    Jan 16 at 2:04
  • Thanks for the comments, I has assumed, apparently wrongly, that Ampere would subtract the consumption from the displayed charging speed Jan 16 at 2:11
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    nevertheless you are using wrong cable. buy another cable with 200 Ω resistor on data pins to let usb charging protocol allow fast charging electronics.stackexchange.com/q/177788
    – alecxs
    Jan 16 at 9:52
  • @Robert thanks for your edit, but please don't reduce the image resolution when changing the size of the displayed image. Jan 16 at 23:45
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As said in the comments, the issue is that Ampere doesn't take into account the battery consumption when showing the charging current.

Example:

AccuBattery, which takes into account the battery consumption when showing the charging current:

enter image description here

Ampere:

enter image description here

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