Welcome @isaacseeto, to the community!
SMARTAG1 can be operated without a battery, but then only works if the harvester from the ST25DV supplies enough power.
Although programming of the STM32L031 contained in the board is carried out via SWD, the VDD pin on the SWD has the function of monitoring the voltage at the target during programming (or debugging), but not for supplying the STM32L0. SWD VDD is therefore an output for SMARTAG1, not an input.
However, if you are creating your own PCB anyway, you could provide an additional connector that supplies the PCB instead of the battery?
BTW: the humidity sensor HTS221 has already been set to NRND (Not Recommended for New Design), so it is only a matter of time before it is finally discontinued.
Hope that helps?
Regards
/Peter
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