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Blue Sea 7608 20A BatteryLink® Charger


Charge two batteries at or away from shore power with a 20A multistage battery charger and integrated 170A 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 20 Amp 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 170A ACR
  • Battery Temperature Compensation prolongs battery life
  • Start isolation protects sensitive electronics from voltage sags and spikes
  • Emergency parallel allows remote ability to jump start by combining both batteries if start battery is low – single pole/single throw switch required (sold separately)
  • Includes LED remote indicator for charge status at the helm
  • Snap-on insulating cover
  • One-piece stainless flange nuts ensure safe and secure connections

AC & DC Battery Charging Explained

  • AC & DC Battery Charging Explained DC Charging (Away from the Dock or Garage)

The BatteryLink Charger incorporates DC charging through an integrated Automatic Charging Relay (ACR). An ACR uses a relay combined with a voltage sensing circuit. When a DC charge is applied to the start battery, and causes the voltage to rise above 13.0V, the relay closes and combines the two batteries to share the charge. When the charge is taken away or a load on the battery causes the voltage to drop below 12.75V, the relay will open, isolating the two batteries. This means that even when the BatteryLink Charger is disconnected from AC power you can charge both your battery banks with a DC charging source, like 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. However, unlike a typical two bank charger, the BatteryLink Charger will charge both batteries simultaneously using the integrated ACR. 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.


Designed and constructed for compliance to UL-1236 Marine, CSA 22.2 No. 107.2 and ABYC A-31 standards. Ignition protected per ISO 8846 and SAE J1171. Meets FCC Part 15, Class B requirements. Designed and tested to comply with California Energy Commission (CEC) efficiency standards. Waterproof IP67 – protected against immersion up to 1 meter for 30 minutes.

Specification Heading Specification Detail
Weight 6.75 lbs
Total Output Current 20A
Nominal Output Voltage 12V DC
ACR Continuous Rating 170A
Output Connections 1 Negative | 2 Positive
Universal AC Input Voltage Range 100-240V AC
AC Input Frequency 50/60 Hz
Operating Current (No AC) 10 mA
AC Plug Style NEMA 5-15P
Battery Chemistries AGM | Flooded | TPPL
Recommended Minimum Battery Capacity 100Ah (per bank)
Recommended Maximum Battery Capacity 400Ah (total combined)
Negative Terminal Stud Size 1/4"-20
Maximum 1/4" Terminal Stud Torque 60 in-lb (6.78 Nm)
Positive Terminal Stud Size 3/8"-16
Maximum 3/8" Terminal Stud Torque 140 in-lb (15.82 Nm)
ACR Combine Voltage 13.0V DC
ACR Open Voltage 12.75V DC


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