Our deep-sea battery solutions are available in depth ratings ranging from 100 meters for shallow-water applications to over 6,000 meters for full ocean depth missions. The pressure-compensated oil-filled design can theoretically operate at any depth, while our titanium-housed systems are pressure-rated to specific depth specifications verified through hydrostatic testing.

Pressure compensation works by immersing the battery cells and internal components in a specialized dielectric insulating oil within a flexible or semi-rigid enclosure. As external hydrostatic pressure increases with depth, the oil transmits this pressure evenly to all internal components, equalizing internal and external pressure. This eliminates the stress differential that would otherwise cause rigid enclosures to deform or collapse, allowing the battery to operate safely at extreme depths.

Yes, PKCELL offers underwater charging solutions for permanent or semi-permanent subsea installations. These systems use inductive charging technology or wet-mateable connectors to enable battery recharging without recovery to the surface. Underwater charging is particularly valuable for ocean observatories, permanent monitoring stations, and AUV docking stations where frequent recovery is impractical.

The service life depends on the specific application, depth profile, and discharge conditions. Typically, our deep-sea lithium-ion battery systems provide 1,000+ full depth cycles with capacity retention above 80%. For shallow-water applications with less stress on sealing and structural components, service life can exceed 2,000 cycles. Proper maintenance, including periodic inspection of seals and connectors, is essential for maximizing service life.