Bluefin 1.5 kWh Subsea Battery

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 Unmanned Underwater Vehicles (UUVs)
  • Remotely Operated Vehicles (ROVs)
  • Profilers
  • Buoys
  • Submersible Systems


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

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