CFS as a Filament Dryer?

Is the CFS with good desiccants supposed to keep the filament spools dry when it’s not powered up? I was surprised to see all my orange desiccant beads dark brown and the RH reading up around 65% when I turned the printer on after a couple weeks of non-use.

Follow up question: Is there a way to keep the CFS powered up all the time, even though the printer itself is powered off?

Thanks!

Only if you use an alternate power supply…