The DSO Quad is showing the battery as empty (red square) and voltage Vbt +2.85V
But the real battery voltage measured with another tool is 4.0V
HWv2.6 / FPGA 2.6 / SYS 1.51 / APP 2.52 calobration done
If I plug the USB, Vbt is 4.85V and the red LED is bright showing charging and never stops.
The problem is also when measuring voltage.
for example instead of 5V Vdc measured is 6.2v but if I plug the Usb then the voltage measured is 4.96V on the same caliber (1V)
If the battery voltage drops below 3.8V then Vbt is measured and Battery indicator is half full.
But still I have an offset in the measure (6.4V instead of 5V).
Do you know what could be the problem ?
Is it possible that the calibration differ if it is connected to USB or not ?