UK battery manufacturer Volklec has entered the marine sector through a multimillion-pound agreement with offshore technology specialist Walker Subsea to develop the D-SEA battery pack.
D-SEA is a first-to-market underwater battery pack powered by Volklec’s 21700-5000mAh energy cells.
Designed to deliver onboard energy storage for Remotely Operated Vehicles (ROVs), the D-SEA battery pack represents a major leap in subsea autonomy. ROVs are currently reliant on power supplied via tethered support vessels. In a global market worth $5.9bn, underwater battery systems are emerging as a critical enabler for offshore renewable energy construction and defence of vital ocean infrastructure.
Thanks to the team’s deep expertise in battery systems and a fast-paced development approach, underwater trials of the D-SEA battery pack are scheduled to begin in Q1 2026.
“At Volklec, we drive technological innovation by collaboratively designing, manufacturing and delivering sovereign energy storage solutions for our clients,” said Junaid Mujaver, chief operating officer at Volklec. “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.”
“It was critical for us to use a UK-based manufacturer for sustainability, supply chain de-risking and to enable sovereign capability,” added Vahid Walker, technical director at Walker Subsea. “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.”
