There is often the questions about which motor shows the highest efficiency. In particular when talking about applications with limited power supply, such as a battery driven tool or a solar panel powered satellite. It’s worth expanding the question to the full drive system consisting of controller, motor, gearhead and other mechanics…
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...