The 1S-Series sub-miniature rocker switches from Carling come in sealed and sealed surface mount variations and have contact resistance of 20 mΩ max with initial @ 2-4 VDC 100mA for both silver & gold plated contacts. Further specifications are provided in the data sheet.
Invinity to build 20MWh flow battery in UK
Redux flow cells have had nowhere near the R+D effort compared to Lithium ion. They certainly have the potential (pun not intended) for longer...