--- title: "Qualification" canonical: "https://anchor.is/the-hysteresis/issue/8/qualification" publication: "The Hysteresis" publisher: "The Hysteresis" language: "en-US" guide: "https://anchor.is/the-hysteresis/llms.txt" permalink: "https://anchor.is/the-hysteresis/issue/8/qualification" issue: 8 section: "qualification" description: "Pack-level requirements, test conditions, and standards by application" authors: ["Ronan Adike"] published: 2026-08-03 updated: 2026-07-31 articles: 17 --- # The Hysteresis > The Hysteresis exists to give a small cross-functional team — strategy, investment, and procurement — a shared weekly instrument for reading the battery supply chain earlier than consensus. Success means the team consistently identifies inflection points in cell pricing, supplier health, and policy enforcement weeks or months before they surface in earnings calls, annual surveys, or trade press. The commercial mechanism is internal-first: the publication proves itself as a decision tool inside the organization, then extends to paid subscribers and a practitioner community as upside. Revenue follows utility — if the team makes better-timed procurement calls and competitive assessments because of what they read here, the publication earned its place. [Read on the website]() ## Issue 8 — Qualification Pack-level requirements, test conditions, and standards by application ### Subsea Standards Map - [Subsea and UUV Pack Qualification: Governed Rows and Named Voids]() — By [Ronan Adike]() · Published 2026-07-31 · Format: The Standards Map ABS governs lithium battery installation in underwater vehicles down to the subclause: pre-installation risk analysis, an enumerated set of BMS protection functions, third-party cell certification, pressure testing to design depth, vehicle trials. It never puts a value on any of it. The most consequential clause on this card, §10/11.5.6(a), contains exactly one number, and that number is the one-atmosphere applicability trigger. What follows extracts every published requirement in the lane, sorts the missing values into the ones your program owes and the ones nobody has written, and names the largest void: propagation under external hydrostatic pressure. It also corrects Issue #6. ### Document Landscape Eight documents surface repeatedly when planning subsea battery pack qualification. Most governing authority concentrates in one source: the ABS Rules for Building and Classing Underwater Vehicles, Systems and Hyperbaric Facilities, January 2025 edition, confirmed unchanged through the January 2026 Rule Change Notice. IEC 62619 and UN 38.3 play supporting roles. Two ISO standards are included because they do not govern batteries, and citing them as though they do is a traceable DVP error. The pattern across these documents is consistent: safety architecture requirements are enumerated (housing type, BMS functions, certification basis), while performance thresholds are not. Energy, C-rate, cycle life, and depth derating are delegated to the vehicle program. Most DVP rows trace back to ABS, but the numeric content of those rows is yours to define and defend. Last verified: July 31, 2026. - **ABS §10/11.5 Sets Subsea Pack Safety Architecture** — [Source]() — Published 2026-07-31 Tag: Battery Safety January 2025 edition (unchanged per 2026 notice) requires third-party certification to UN 38.3, UL 1642, or IEC 62619; marine suitability evidence; housing selection (one-atmosphere or pressure-compensated); and BMS functional requirements per §10/11.5.4. No energy density, cycle life, or C-rate thresholds appear. DVP action: create rows for certification basis, housing type selection, and each BMS function enumerated in §10/11.5.4. - **§10/11.5.6 Requires Pressure Test, Leaves Protocol Open** — [Source]() — Published 2026-07-31 Tag: Pressure Testing Mandates pressure testing to design depth with satisfactory operation demonstrated, plus Surveyor-witnessed BMS functional testing. Cycle count, hold duration, pressurization rate, and monitoring instrumentation are not prescribed. The program defines these in consultation with ABS at plan approval. DVP action: define and document the pressure test protocol as a program-specific line item, not a standard citation. - **§19/33.3 States the Objective, Not the Number** — [Source]() — Published 2026-07-31 Tag: Power Adequacy The 2024 rule requires the on-board power source to have adequate capacity for mission duration. Full stop. No Wh floor, no Wh/kg target, no C-rate limit, no DOD ceiling, no derating factor. Energy budget, margin policy, and worst-case assumptions are entirely program-defined. DVP action: build energy adequacy analysis as a program-owned deliverable traceable to this clause. - **§19/37 Acceptance Tests Include Battery Functional Demonstration** — [Source]() — Published 2026-07-31 Tag: Vehicle Trials Five Surveyor-witnessed tests are mandated: piping hydrostatic, insulation resistance, functional testing of all systems, test dive, and sea trials. Battery pressure and BMS functional tests per §10/11.5.6 map to the functional testing and test dive events. Trial procedures remain program-defined. DVP action: link battery test rows to the §19/37 acceptance test sequence and confirm Surveyor witness points. - **IEC 62619 Scopes Industrial Batteries, Including Marine** — [Source]() — Published 2026-07-31 Tag: Industrial Safety Edition 2.0 (2022-05-24, stability date 2026) covers secondary lithium batteries for industrial applications, marine vehicles included. Contains a battery-system propagation test (Clause 7.3.3) and abuse tests. Clause-level acceptance criteria require the licensed standard text. Does not address subsea pressure envelopes or mission-specific profiles. DVP action: cite for safety and abuse test rows; do not cite for pressure or performance. - **UN 38.3 Governs Transport, Not Operational Suitability** — [Source]() — Published 2026-07-31 Tag: Transport Qualification Rev 8 Amendment 1 (2025) establishes transport eligibility through type-level abuse tests. ABS §10/11.5.1(c) also accepts it as battery-safety certification evidence. The 20 Wh/cell and 100 Wh/battery values are transport-classification thresholds, not performance specifications. DVP action: maintain separate rows for transport eligibility and ABS certification basis. Do not conflate the two claims. - **ISO 20682 Explicitly Excludes Batteries From AUV Scope** — [Source]() — Published 2026-07-31 Tag: Gap Marker Published February 2026, this first-edition AUV risk standard covers sensors, communication, and digital-mission components. Its abstract explicitly excludes batteries and electrical motors. No ISO standard currently governs AUV battery qualification. DVP action: do not cite for any battery row. Included here to prevent misassignment. - **ISO 21173 Governs Pressure Hulls, Not Battery Housings** — [Source]() — Published 2026-07-31 Tag: Pressure Structures Edition 1 (2019, confirmed 2025) specifies hydrostatic pressure testing for pressure hulls, viewports, hatches, connectors, and buoyancy materials. Battery packs and housings fall outside its scope. Battery housing pressure testing is governed by ABS §10/11.5.6(a). DVP action: do not cite for battery housing rows. Included to prevent a common misassignment. ### Pressure Architecture Study - **A Novel Pressure Compensated Structure of Lithium-Ion Battery Pack for Deep-Sea Autonomous Underwater Vehicle** — [Source]() — Published 2026-07-31 Compares structural weight fractions of rigid-hull and piston-based oil-immersed battery housings across 300–6,000 m (3–60 MPa). Reports ~18.3% system-level mass reduction at 6,000 m for the compensated design. Provides architecture-selection evidence only. No acceptance criteria, no cycling under pressure, no thermal runaway characterization. Tier 3 source. What's missing for DVP use? No qualification thresholds, no cycle-life data under pressure, no safety outcomes. Acceptance criteria must still originate from ABS §10/11.5.6 or program specification. Where does it help? Architecture trade-off data spanning the full 300–6,000 m envelope, useful for housing concept selection before a program freezes design depth. - **Review of Energy Technologies for Unmanned Underwater Vehicles** — [Source]() — Published 2026-07-31 Open-access 2026 review independently corroborates Li et al.'s mass-reduction figures and adds a technology comparison: 140–180 Wh/kg system-level (gravimetric) for oil-filled architectures versus 100–130 Wh/kg for rigid hulls. Identifies 2,000 m as the depth where rigid-hull structural mass begins dominating system weight. Tier 3 peer-reviewed analysis, not standard-set values. What sourcing tier applies? Tier 3 analysis-derived figures from a peer-reviewed review. Engineers should pull the Li et al. primary text before committing any DVP row. What threshold matters? 2,000 m is identified as the critical depth where rigid-hull structural mass sharply erodes payload capacity and system-level specific energy. ### Authority Structure - [The Subsea Authority Chain Runs Through Class, Not ISO]() — By [Ronan Adike]() · Published 2026-07-31 If you are populating a UUV pack DVP and looking for the ISO number that anchors it, there isn't one. The exclusion is written into the documents themselves. ### Source Trail - **ABS Rules for Underwater Vehicles (Jan 2025), Section 10/11.5: Lithium Battery Pack Certification and Pressure Testing** — [Source]() — Published 2026-07-31 Governing framework for AUV/UUV pack qualification: BMS requirements, housing standards, pressure-test-to-design-depth criteria. - **ABS January 2026 Change Notice: Subsea Battery Sections (10/11.5, 19) Confirmed Unchanged** — [Source]() — Published 2026-07-31 No amendments to battery or BMS provisions in the 2026 cycle. January 2025 text remains current. - **Pressure-Compensated vs. Pressure-Tolerated Subsea Battery Housings: Structural Mass Penalty to 6,000 m (Li et al. 2024)** — [Source]() — Published 2026-07-31 Quantifies housing mass trade-offs across depth ratings; proposes piston-based oil-immersion compensator architecture for AUV packs. - **Deep-Sea Pack Architecture Survey: Pressure-Compensated Battery Design Options for AUV Applications** — [Source]() — Published 2026-07-31 Springer review contextualizes Li et al. 2024 housing analysis within broader underwater power battery literature. - **ASTM F3830-26 Published: Rechargeable Lithium EESS Qualification for Light-Sport Aircraft Propulsion** — [Source]() — Published 2026-07-31 First consensus standard for light-sport battery packs. Scope excludes type-certificated powered-lift programs. ## Other sections in Issue 8 - [Signal]() - [China]() - [Korea]() - [The Log]() - [Defense]() ## More - [Publication guide]() - [Issue archive]()