Hi Thooman,
If you use the internal capacitor by configuring the RTC_CR, and your board's crystal can oscillating after enable the OSC, then you don't need to welding external load capacitor.
But I suggest you add the external capacitor pcb package for the hardware crystal circuit testing.
Wish it helps you!
If you still have question, please let me know!
Have a great day,
Kerry
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