Permatex Dielectric Tune-Up Grease
Dielectric grease is the cheapest fix for a whole class of e-bike gremlins: intermittent displays, flickering lights and charge ports that corrode after a wet ride. A thin film on the rubber seals and around the pins of waterproof connectors keeps water and oxygen out. It does not conduct electricity, so you apply it sparingly to the connector body and seals rather than packing the pins. The Permatex tube is the automotive standard, widely sold, and lasts forever. Do not use it on battery contacts or anywhere the maker says to keep dry, and disconnect the battery before working on connectors.
Best for: Sealing Julet/Higo connectors against water · Charge port and display connector protection · Preventing corrosion on outdoor-stored bikes
Sold on Amazon