If my USB charger for AA/AAA NiMH batteries by BTY charges a NiMH battery, the current (ampèrage) of charge only depends on the USB input voltage (usually 5V) and the battery manufacturer (input current at 5V USB varies between 0.12A and 0.17A).
It keeps drawing the same power forever, even if the NiMH battery is full. The only difference is that the NiMH battery gets warm if charged completely.
I measured it with an USB multimeter (KW203).
That BTY charger has no charging controller.
Why does the charger keep drawing the same power forever?