@felmue Unfortunately, I can't find the AXP dump from that condition to double check but the current loop was there and was very annoying! Oh, I think I missed to specify that the charging current of the LiPo cell was limited from registers to 360mA! It was definetly a current loop but I solved it and this is what matters... VBUS must be set to OFF when EXTEN is Enable otherwise the AXP IPS will try to charge the battery from itself after the voltage is raised to 5V through SY7088! Cheers, Adrian