Battery Cable - Gauges from 6 through 4/0 - WiringProducts, Ltd. – Wiring Products
2/0 Gauge (AWG) Single Red Pure Copper Battery Cable Wire with Lug Con – Windy Nation Inc
WNI 4/0 Gauge 10 Feet Black 10 Feet Red 4/0 AWG Ultra Flexible Welding Battery Copper Cable Wire - Made In The USA - Car, Inverter, RV, Solar - - Amazon.com
ZRD FAQ - Wire sizing
Battery Cable - Gauges from 6 through 4/0 - WiringProducts, Ltd. – Wiring Products