STOP2 is activated with the extended HAL function HAL_PWREx_EnterSTOP2Mode(PWR_STOPENTRY_WFI) I discovered that in fact the STM32 was put into STOP1 mode, while there is a more economic one, STOP2, which, however, takes longer startup time (does not matter in my case). Previously the calculator consumed 40-55 uA of current from the 3V battery, which was to my knowledge a bit on a higher side of what one should expect from STM32L476 in STOP mode. I think I've solved all my problems with power consumption being somewhat higher than I hoped.
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