Crap LiFePO4 cells bought from shonky seller on Ali

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MaryB_MN Newbie Joined: 03/08/2024 Location: United States Posts: 15	Posted: 01:25pm 17 Oct 2024         Murphy's friend said   Aaron, stainless steel (any grade) and aluminium are a *very* bad combination. I know this because for many years I had a sailboat and If I did not insulate these two from each other they would corrode (electrolysis). Actually, stainless only stays so in the presence of oxygen. If you place it in a sealed space with some kind of electrolyte it will suffer what's called crevice corrosion. The picture of your bolts & nuts show evidence of that. The big (200Ah) lithium cell I have do use stainless bolts for the connection but these go into a blind hole, no access to the battery inside. Negative terminal bolt screws into a copper electrode connection, the positive into an alumunium electrode connection, both are blind holes. Aluminum with stainless hardware is how ham radio antennas are built... never had a problem with corrosion. Its when you add saltwater and can create a path for electric current to flow... Whole lot of stainless and aluminum up in the air...