The 'Eco-Dry' absorbs a lot of moisture in the first 24 hours before the silica gels in there get saturated. What you can do is leave it outside for 24 hours after charging, then put it into your dry box.
This is what I use in my dry box. Some may say it's a pain to change all the time, and some will say it contains elements that will cause cancer, but the dry box plus silica gels solution works for me, I spend $3 a year and it suit me well (I do move from places to places quite a bit).
This I agree, but with experience you will know when to check and change the silica gels. And besides, I'm sure those with electric dry cabinet also constantly check that their dry cabinet is maintained at 45-55%, so I guess it doesn't make a difference