Add A Battery Kit 120A Dual Circuit System With Automatic Charging Relay And Dual Circuit Plus Switch For Starter And House Banks No-Fuss Emergency Power On Demand For Boats And RVs

120A Dual-Circuit Marine Battery Kit with Auto Relay ✔️ 1-pack marine battery kit, dual-circuit switch, 120A rating

The 120A dual-battery add-on kit delivers automatic battery management for boats with two banks. Built for inboards and larger outboards, it simplifies charging and switching without extra regulators or isolators. The dual circuit switch controls starter and house banks with a single ON/OFF operation for simple daily use.

✅ Automatic Charging Relay senses voltage and links batteries during engine operation; isolates at rest to protect electronics and preserve starting power.
✅ Dual Circuit Plus switch independently manages starter and house banks with a single ON/OFF for everyday use.
✅ Emergency parallel function links banks for engine starting if one bank is discharged.
✅ Marine-rated tin-plated copper studs resist corrosion for reliable conductivity in harsh environments.
✅ No external regulators or isolators required for simple, reliable battery management.

💡 What is a marine battery management system used for in boats and RVs to coordinate dual battery banks?

A handy setup helps coordinate two battery banks for reliable starting and efficient charging.
- aids starting power and charging balance across two battery banks
- automatically links banks during engine charging and isolates when at rest
- provides emergency parallel capability if one bank drops too low