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Heavy duty welding cable. Very flexible (fine stranding)

This is really called Welding cable but works better than "Battery Cable" for Electric Vehicles.

Welding Cable is made with very fine copper wire & insulated with synthetic rubber. It's more flexible than battery cable, especially in cold temperatures. Welding cable is easier to route in tight spaces.

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Heavy Duty Welding Cable made in the U.S.A. and has a heavy neoprene insulation which is very flexible and durable.
This is not the cheap cable with pvc insulation you see advertised.
The best choice for battery interconnects (within the amperage range), controller to battery circuits and portable systems where quick disconnects are used.