Mercury - Thruster Power to Battery Cable (30 ft) Rigging Accessory 84-8M0174062. OverviewThis 30-foot power cable gives your thruster a solid, direct feed from the battery, which is exactly what you need on bigger boats or rigs where the battery sits a long way from the thruster module. The extra length keeps you from forcing sharp bends or stretching a shorter cable across the boat. Once it's installed, the thruster usually reacts with steadier push, especially when you're sliding into a slip