This is exactly my problem. The circular back part was left on the charger when my wife lifted it off one day.
I can see there is a ribbon that has a connector which seems to mate quite easily with its opposite, I think it is magnetic. There is the remains of a black substance on both mating surfaces, stuck to one side or the other. I have cleaned off this residue with a sharp blade, then cleaned both with isopropanol.
I have good experience with using Sikaflex in the marine world. It is a flexible sealing glue that never goes hard and is effective in the worst of conditions. With a toothpick I spread this around the hole, then ensuring that the magnetic connector mated, pressed the 2 sides together.
So far... so good. Time will tell if this is a long term solution.
Rory
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