Just took my Mavic for a flight using two batteries. Finished flying and brought my Mavic inside to charge the batteries. I placed my two batteries into the charging dock, as I usually do, and when I did so the light on the charging dock went red. And the green light closest to the power switch...
I've got the Battery Charging Hub for the Mavic Pro for sale. It came in my Fly More Combo. Charges 4 batteries in sequence. Box never opened. Hooks up to standard charger to work.
Brand new for $30 with free shipping inside the USA.