Optimate O3 SAE Charge Extension Lead - 1.8m 180cm Weatherproof Plug Connector

Extension cable for SAE compatible OptiMates to enable them to be used further from the vehicle or battery. Simply plug one end into the outlet lead of the OptiMate and the other end into the accessory cable (e.g. eyelet lead as supplied with OptiMate, or another SAE accessory).

eBay