The Bluefin 1.5 kWh Subsea Battery is a pressure-tolerant lithium-polymer battery that provides a reliable, high-energy density power solution for underwater systems. The battery electronics include built-in protection, monitoring, power control, and battery conditioning. Leveraging over a decade of battery development and with hundreds of units in the field, the 1.5 kWh Subsea Battery has demonstrated utility across a variety of underwater applications, including:

  • Autonomous Underwater Vehicles (AUVs)
  • Remotely Operated Vehicles (ROVs)
  • Profilers
  • Buoys
  • Submersible Systems

General Dynamics acquired Bluefin Robotics in February 2016.

Product Details


The 1.5 kWh Subsea Battery is designed for direct submergence in water in any orientation, eliminating the need for a pressure vessel.

The lithium-polymer chemistry provides extremely high energy density while still maintaining good cycle life and performance, which are desirable for subsea applications.

The design of the 1.5 kWh Subsea Battery allows a user to quickly replace a discharged battery with a charged one without ever opening a pressure vessel. This enables rapid turnaround of submersible equipment in the field.

With the fully automated charging system, full battery recharge can be accomplished in six hours or less.

  • Rechargeable lithium-polymer cells
  • Housing is internally pressure-compensated with oil
  • Wet-mateable connectors simplify cable management when used with Bluefin
    junction boxes
  • Serial communications
  • Safety electronics for monitoring and prevention
    of over-voltage, under-voltage, over-current and over-temperature conditions
  • UN-certified, stainless-steel shipping container included, which allows shipment via any mode (ground, sea or air)

Available Accessories

  • Charger (with cable)
  • Discharger (with cable)
  • Multi-Battery Junction Box
  • Mating Connector

We also provide Engineering Services for custom battery designs. Please contact us with your specific requirements.


(L x W x H)
15.1 x 5.2 x 8.2 in
(38.4 x 13.3 x 21 cm)
Weight (Dry) 31.5 lb (14.3 kg)
Displacement 8.12 liters
Depth Rating 6,000 m
Energy 1.5 kWh
Voltage (Nominal) 30 V
Capacity (Nominal) 48 Ah
Cycle Life* 300-500 cycles to better than 80%
depending on actual conditions
Discharge Current 10 A nominal
30 A maximum
Discharge Temperature -20 to 48° C
Charge Current 12 A nominal
15 A maximum
Charge Temperature 0 to 48° C