Volklec and Walker Subsea partner on underwater battery pack

UK battery manufacturer Volklec is expanding into the marine sector with a new underwater power system agreement.

Volklec has joined forces with offshore technology specialist Walker Subsea to develop a next-generation subsea power solution that — the firm claims — could transform the way construction and military operations are performed on the seabed.

Under a multimillion-pound agreement, the two firms will collaborate on the D-Sea underwater battery pack, a first-to-market system powered by Volklec’s high-performance 21700-5000mAh energy cells. Delivering a major step forward in subsea vehicle autonomy, D-Sea provides onboard energy storage to remotely operated vehicles (ROVs), currently limited by dependence on power from a support vessel.

In a global market valued at $5.9bn, underwater battery power is a key enabling technology for the construction of offshore renewable energy sites and the defence of critical ocean infrastructure. The project is now scheduled for underwater trials in Q1 2026.

Junaid Mujaver, chief operating officer at Volklec, says: “At Volklec, we drive technological innovation by collaboratively designing, manufacturing and delivering sovereign energy storage solutions for our clients. Marking the latest exciting collaboration of several projects currently in the pipeline, we’re now helping Walker Subsea create a novel and powerful underwater energy storage device with a range of applications for the marine and defence sectors.”

Vahid Walker, technical director at Walker Subsea, adds: “It was critical for us to use a UK-based manufacturer for sustainability, supply chain de-risking and to enable sovereign capability. D-Sea marks just the first step in our long journey towards full, wireless capabilities for underwater transport, and the energy cells supplied by Volklec offer a significant step towards realising this vision.”