I have seen it recommended to coat them in Christo Lube. Problem is it dries out, and it is conductive. So you have to balance water protection with shorting your cells. Haven't found any dielectric grease that is compatible with a breathing environment.
All surfaces must be completely clean and dry. Before applying silicone sealant.
Cover the backend of the connector to make a seal around the wires. Also put some Christo Lube into the holes on the side where the pins clip in. This allows the air inside to compress, but shouldn't short the wires. Be careful not to get any on the connector face. Put a thin film of silicone sealant on the face and plug it in. Don't dive it until the silicone is dry (24 hours).
This is food grade 100% silicone sealant. Do not use silicone grease as this is a 100% oxygen environment. Let the sealant dry completely before use.
I have the KISS splitter board so mine plug in to it, but same concept. I have cut out "o-rings" from old silicone wrist seals and placed around the board receptacle where the cells plug in to seal the back of the cells. This allows me to change cells on the fly without waiting for silicone sealant to dry. The board is already waterproof from the factory.
This has greatly increased the stability of readings during long dives/trips. I no longer expect the cells to get more erratic as time goes on during a trip. They typically get more stable after day one then stay that way for the entire trip.
