Underwater is the least forgiving place to put a lithium battery. Pressure, seawater, sealed hulls and no way to intervene mid-mission. We design packs for AUVs, ROVs and subsea systems where the battery simply cannot be the thing that fails.
An underwater vehicle's battery works inside a sealed hull, under pressure, surrounded by conductive saltwater, and a failure ends the mission, or the vehicle. The pack has to be engineered for that environment from the first sketch.
Whether the pack sits in a one-atmosphere housing or must tolerate ambient pressure, the mechanical design, cell format and potting strategy are depth decisions. A pack designed for the bench behaves differently at operating depth.
Seawater is conductive and corrosive. Sealing strategy, connector selection, penetrator interfaces and internal conformal protection determine whether a minor seep becomes a lost vehicle.
Battery mass drives ballast, trim and endurance simultaneously. Cell selection and pack packaging must maximise watt-hours inside a fixed hull volume and a fixed weight budget. There is no adding a bigger battery later.
A nuisance BMS cutoff at depth is not an inconvenience; it's a recovery operation. Protection logic, redundancy and fail-safe behaviour must be designed for a vehicle that can't be power-cycled by hand.
We start from your hull sections, depth rating and mission endurance, and design the pack into the vehicle, not alongside it.
Cylindrical, saddle and free-form pack layouts designed to your pressure housing or wet section, keeping mass where your trim calculations want it.
Enclosure sealing strategy, subsea connector and penetrator interfaces specified with your vehicle's architecture, not adapted to it afterwards.
High-energy Li-ion/NMC for survey endurance; LFP where cycle life and thermal stability matter more, as on daily-duty inspection ROVs.
Protection thresholds, balancing and fault logic configured for missions where the vehicle cannot be manually reset, including graceful degradation instead of hard cutoffs.
Marine-grade hardware, coatings and material pairings selected to survive salt spray, immersion cycles and deck handling between deployments.
State of charge, health and temperature streamed over RS-485/CAN into your vehicle bus, so pilots and mission planners see real energy state, not estimates.
Mission-profile energy modelling (thruster load, hotel load, payload duty) so endurance predictions hold in the water, not just the spreadsheet.
Enclosure and interface sealing evaluated through immersion and pressure-cycling checks before the pack ships.
Cell-level fusing, thermal isolation and fault containment designed for a battery that operates inside a sealed, unattended hull.
Incoming cell QC, batch traceability and documented test records for every pack, built for programmes that audit their supply chain.
Compact, high-cycle packs for daily-duty inspection vehicles working ports, hulls, dams and offshore structures.
High-energy-density packs that turn fixed hull volume into maximum mission endurance for mapping and survey work.
High-capacity packs for tracked subsea vehicles and resident systems with long deployment windows.
Packs built for repeated immersion cycles, wash-down handling and hard daily service schedules.
Long-duration, low-drain packs for moored and drifting instrumentation and research platforms.
Sealed, traceable packs for maritime security and defence subsea programmes. See defence robotics packs →
Subsea programmes are iterative by nature: hull revisions, payload changes, deeper ratings. You need a battery partner who treats the pack as part of the vehicle design, and moves with it.
Your engineers talk to our pack designers, not a sales layer. Requirement discussions happen in volts, amps and millimetres.
We build packs in ones and tens for development, then scale the same design into production.
Local engineering, local manufacturing, local support. Short iteration loops and a supply chain your programme can actually visit.
Beyond the pack: chargers, smart-battery telemetry and monitoring from one partner, so your power system is designed as a whole.
Share your platform's power budget, envelope, duty cycle and environment, under NDA where needed.
Cell selection, pack architecture, BMS configuration and mechanical design proposed against your spec.
Working packs on your platform for field trials; design iterated on real mission data.
Repeatable manufacture with cell QC, end-of-line testing and batch traceability.
Tell us your hull envelope, depth rating and endurance target. Our engineering team will come back with a pack architecture proposal, not a brochure.
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