You mean the AVCC and AGND? No, it’s isn’t connected. Since is working without, i thought it isn’t necessary. I will connect them to VCC and GND
It’s done via the low power lib:
LowPower.powerDown(SLEEP_8S, ADC_OFF, BOD_OFF);
I like the idea with the INA219, it isn’t expensive and I will get continous data. I’m not sure if I understand what you mean by " increase the sense resistor and bypass it with a capacitor", but I think to check where the leak is, normal connection should be ok.