Blue Sea 7605 BatteryLink® Charger - 10Amp - 2-Bank

Charge two batteries at or away from the dock with a 10A multistage battery charger and an integrated 65A Automatic Charging Relay (ACR)

• AC charging at the dock or garage: Use AC shore power to charge two isolated battery banks with the 3 stage battery charger
• DC charging away from the dock or garage: Share the DC power from the alternator with both the Start and the Auxiliary battery through the integrated ACR
• Emergency jump start by combining both batteries if start battery is low (20A model only) - single pole/ single throw switch required (sold separately)
• Battery temperature compensation prolongs battery life
• Start isolation protects sensitive electronics from voltage sags and spikes
• Includes LED remote indicator for charge status at the helm
• Snap-on insulating cover

AC and DC Battery Charging Explained: 

DC Charging (Away from the Dock or Garage)

The BatteryLink Charger features direct current charging via an integrated Automatic Charging Relay (ACR). An ACR combines a relay with a voltage-sensing circuit. When a direct current charge is applied to the start battery and the voltage rises above 13.0V, the relay closes and the two batteries combine to share the charge. When the charge is removed or the voltage drops below 12.75V due to a load on the battery, the relay opens, isolating the two batteries. This means that even if the BatteryLink Charger is not connected to AC power, you can charge both battery banks using a DC charging source, such as an engine alternator.

AC Charging (At the Dock or Garage)

The BatteryLink Charger is powered by AC when the cord is plugged in and will source current to charge your batteries.

But unlike a typical two-bank charger, the ACR built into the BatteryLink Charger will charge both batteries at the same time.

This works in the same way as when an external DC charging source is used.

When AC power is applied and the voltage of the start battery rises above 13.0V, the ACR will close.

This combines the batteries, allowing charge current to flow to the auxiliary battery as well as the start battery. For this reason, the BatteryLink Charger can only be used in 12V applications.