Specifications are subject to change. See bluesea.com/products/7606 for current information.
3
BatteryLink
®
Charger Features
The BatteryLink® Charger is a 120V AC/230V AC nominal input, 12V DC nominal output, 20A battery charger with
integral battery combiner (ACR) providing a second battery connection, as well as standard ACR function
when AC power is not present.
• AC plug-in at the dock, provides 20A of charge current
• Integrated ACR automatically combines batteries during charging, isolates batteries when discharging and
when starting engines
• Start isolation protects sensitive electronics from voltage sags and spikes
• Emergency jump start by using optional remote switch (not included) to combine both batteries if start battery is low
• Battery temperature compensation prolongs battery life
• Supports alternators up to 170A
• One-piece stainless flange nuts ensure safe and secure connections
• Ignition protected—safe for installation aboard gasoline powered boats
• Includes a remote indicator LED with mounting bezel
• Snap-on insulating cover
Automatic Three Stage Charging
The BatteryLink® Charger uses a three stage automatic charging profile. The three stages are referred to as bulk,
absorption, and rest/float. The charger will move between these stages automatically, with no user intervention. When the
charger starts, it goes first to the bulk stage. This is where the first 75% – 80% of charging takes place. It is a constant
current mode, in which the charger outputs as much current as it can to drive the voltage of the battery up to the
absorption voltage. Once the absorption voltage is reached, the charger enters absorption mode. This is a constant
voltage mode, in which the battery is held at the absorption voltage to complete the last 20% – 25% of charging. In the
absorption stage, current will decrease according to the batteries’ needs plus any additional current required for active
loads. The length of time spent in the absorption stage will vary based on battery type, battery capacity, and the pres-
ence of loads, but will be a minimum of 1 hour up to a maximum of 5 hours. Added loads causing the charger to reach
its current limit will result in transition back to bulk mode, and time will be added back to the absorption timer while in
bulk. After the absorption stage, the charger will move to the rest/float stage. The float stage is a constant voltage mode
intended to maintain fully charged batteries while supplying current for loads as necessary. The rest mode is included
as an energy saving mode, and for compliance with California Energy Commission (CEC) and U.S. Department of Energy
(DOE) requirements. In the rest stage, the charger output is turned off to conserve energy, and the battery voltages are
monitored. If loads or self-discharge on either battery cause the voltage to drop to 12.9V (temperature compensated),
the charger enters float mode for 4 hours in order to maintain the battery and supply current to loads. After seven days of
continuous operation, the charger will repeat the full charge cycle to ensure good battery health.
Bulk
Current
Max Current Limit
Absorption Voltage
Absorption ends after 1 hour if
current is <1A, or 5 hours max.
Float Voltage
Rest End Voltage
Time
Absorption
Float
Rest
Voltage
Time
