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Verdict: Periodic DC load testing on the CN→US lithium corridor is performed as a 7-step maintenance sequence on a 14-day pre-shipment cycle, distinct from UN 38.3 design qualification. Equipment reference: CATL 280Ah LiFePO4 prismatic cell (model 2714898 family), documented in the OEM datasheet revision 2024-03. Evidence date: 2026-09-22. Limitation: this SOP covers sea and ground transport modes only; air transport under IATA Section II is flagged but the airline acceptance procedure is not in scope.
| Decision item | Value |
|---|---|
| Equipment model / family | CATL 280Ah LFP prismatic cell (family 2714898) |
| OEM manual + revision | CATL 280Ah LFP datasheet, rev. 2024-03 |
| Soak temperature | 23 °C ± 2 °C (CATL datasheet rev. 2024-03, §3.3) |
| Discharge C-rate | 0.5C (140 A) (CATL datasheet rev. 2024-03, §3.4) |
| End-of-discharge voltage | 2.5 V (CATL datasheet rev. 2024-03, §3.4) |
| Sample rate | 1 Hz (CATL datasheet rev. 2024-03, §3.4) |
| Capacity tolerance band | ±3 % vs factory-release baseline |
| Voltage tolerance band | ±50 mV mid-curve |
| Cycle length | 14 days (T-14d → T-0) |
| Maintenance horizon | One full 14-day cycle per consignment, archived in MT-LOG-014 |
| Evidence date | 2026-09-22 |
| Limitation | Sea and ground modes; air-mode Section II procedure out of scope |
Audience: B2B shippers, QA leads, freight forwarders handling lithium cell and pack consignments from China to the United States.
Scope: Periodic DC load testing as a maintenance discipline aligned to IATA DGR Section II/IB provisions (IATA DGR programme page) and 49 CFR 173.185 packaging requirements (eCFR 49 CFR 173.185 permalink).
Out of scope: Cell-level UN 38.3 design qualification (T1–T8) and manufacturing yield programs.
The table below defines the 7-step maintenance sequence for periodic DC load testing on a CN→US corridor consignment. One owner is assigned per step; outputs feed the next input. Soak, C-rate, and end-of-discharge voltage match CATL datasheet rev. 2024-03, §3.3 and §3.4.
| Step # | Action | Owner | Input document | Output document | Done-when |
|---|---|---|---|---|---|
| 1 | Pull reference test reports (UN 38.3 summary, CATL 280Ah LFP datasheet rev. 2024-03, last MT-LOG-013) | QA Engineer | UN38.3-SUMMARY-{cellID}.pdf, CATL-280Ah-LFP-DS-2024-03.pdf, MT-LOG-013.pdf | MT-REQ-014.pdf | Dossier opened in QMS with cell ID, chemistry, and rated capacity confirmed |
| 2 | Schedule corridor window with the forwarder and shipper | Logistics Coordinator | MT-REQ-014.pdf, booking confirmation | WIN-CNUS-014.pdf | Pre-shipment staging date and freezetime documented in MT-LOG-014 |
| 3 | Verify ISO/IEC 17025 calibration of DC load bank, thermocouples, DMM | Metrology Technician | ISO/IEC 17025 calibration certificates for each instrument | CAL-CHK-014.pdf | All instruments within certificate validity date and recorded in MT-LOG-014 |
| 4 | Stage cell at 23 °C ± 2 °C for 4 h soak (CATL DS rev. 2024-03, §3.3) | Lab Operator | CAL-CHK-014.pdf, CATL-280Ah-LFP-DS-2024-03.pdf | STAGE-NOTE-014.pdf | Thermal soak duration ≥ 4 h and chamber within 23 °C ± 2 °C |
| 5 | Apply 0.5C (140 A) DC discharge to 2.5 V at 1 Hz (CATL DS rev. 2024-03, §3.4) | Lab Operator | STAGE-NOTE-014.pdf, CATL-280Ah-LFP-DS-2024-03.pdf | RAW-EXPORT-{cellID}.csv | Discharge completes to 2.5 V without instrument trip |
| 6 | Compare new curve against factory baseline (±3 % capacity, ±50 mV mid-curve) | QA Engineer | RAW-EXPORT-{cellID}.csv, BASELINE-{cellID}.csv | COMP-NOTE-014.pdf | Deviation within tolerance band or flagged for review |
| 7 | Counter-sign and archive | QA Lead | COMP-NOTE-014.pdf, MT-LOG-014.pdf | MT-LOG-014.pdf (closed), ARCHIVE-014.zip | Record archived in consignment dossier and linked to shipment ID |
Each file below is referenced in the process table. Filenames are literal and used in the QMS folder convention.
UN38.3-SUMMARY-{cellID}.pdf — UN 38.3 test summary for the CATL 280Ah LFP cell (per UN Manual of Tests and Criteria, ST/SG/AC.10/11/Rev.7)CATL-280Ah-LFP-DS-2024-03.pdf — CATL 280Ah LFP datasheet, revision 2024-03MT-LOG-013.pdf — prior maintenance log (previous cycle)MT-LOG-014.pdf — current maintenance logMT-REQ-014.pdf — maintenance request dossierWIN-CNUS-014.pdf — test window memo for the CN→US corridor slotCAL-CHK-014.pdf — ISO/IEC 17025 calibration check recordSTAGE-NOTE-014.pdf — 23 °C ± 2 °C staging and thermal soak noteRAW-EXPORT-{cellID}.csv — raw cycler exportBASELINE-{cellID}.csv — factory-release baseline curveCOMP-NOTE-014.pdf — comparison note (new vs baseline)ARCHIVE-014.zip — closed-record archive bundle| Phase | Milestone | Owner | Indicative duration |
|---|---|---|---|
| T-14 d | Pull reference test reports | QA Engineer | 1 business day (8 h) |
| T-13 d | Schedule corridor window | Logistics Coordinator | 1 business day (8 h) |
| T-10 d | ISO/IEC 17025 calibration check | Metrology Technician | 0.5 business day (4 h) |
| T-7 d | 23 °C ± 2 °C thermal soak (≥ 4 h) | Lab Operator | ≥ 4 h soak + 0.5 h setup |
| T-7 d | DC discharge run (0.5C to 2.5 V) | Lab Operator | ~2 h run time at 0.5C |
| T-6 d | Curve comparison (±3 % capacity, ±50 mV) | QA Engineer | 1 business day (8 h) |
| T-5 d | Sign-off & archive | QA Lead | 0.5 business day (4 h) |
| T-3 d | Hand-off to forwarder | Logistics Coordinator | 1 business day (8 h) |
| T-0 | Consignment ships CN→US | Forwarder | n/a |
Line items below carry the unit label for each slot. Values marked not provided indicate no sourced figure was available at publication; the RFQ form is the canonical request channel for vendor-quoted figures.
| Line item | Unit | Indicative slot (USD) | Source status |
|---|---|---|---|
| DC load bench time (per CATL 280Ah cell) | USD per cell per 0.5C discharge cycle | not provided | vendor quote required via RFQ |
| ISO/IEC 17025 calibration of DMM & thermocouples | USD per instrument per 12-month validity | not provided | accredited lab quote required via RFQ |
| Metrology technician labour | USD per hour | not provided | internal rate card — not published |
| QA engineer labour | USD per hour | not provided | internal rate card — not published |
| Lab operator labour | USD per hour | not provided | internal rate card — not published |
| QA Lead sign-off | USD per record | not provided | internal rate card — not published |
| Logistics coordinator labour | USD per hour | not provided | internal rate card — not published |
| Forwarder booking fee (CN→US) | USD per booking | not provided | vendor quote required via RFQ |
| Documentation archive storage | USD per GB per month | not provided | vendor quote required via RFQ |
To obtain sourced figures for the slots marked not provided above, request a CN→US freight and lab quote via the TradVolt RFQ form:
Request a CN→US freight and lab RFQ via tradvolt.com.
| HS code (HTSUS candidate) | Description (illustrative) | Duty rate | Status |
|---|---|---|---|
| 8507.60 | Lithium-ion accumulators (CATL 280Ah LFP cells and packs) | not provided — confirm at USITC HTSUS | Lookup required per shipment at hts.usitc.gov |
| 8504.40 | Static converters (if charger/inverter shipped with pack) | not provided — confirm at USITC HTSUS | Lookup required per shipment at hts.usitc.gov |
| 9032.89 | Automatic regulating or controlling instruments (if BMS shipped separately) | not provided — confirm at USITC HTSUS | Lookup required per shipment at hts.usitc.gov |
Disclaimer: Duty rates above are not provided in this guide. Final classification and duty must be confirmed against the live USITC HTSUS search (hts.usitc.gov) and any applicable Section 301 exclusions before entry. This page is a maintenance process reference and does not constitute customs advice.
One full 14-day pre-shipment cycle per consignment, with the 0.5C discharge step executed at T-7d. Treat the OEM interval (CATL datasheet rev. 2024-03, §3.5) as the upper bound and shorten it if the consignment experiences thermal or vibration events above the OEM envelope. Source: CATL energy storage product page and datasheet rev. 2024-03, §3.5 (model name in text; full datasheet PDF confirmed at RFQ).
No. UN 38.3 (T1–T8) is a design-qualification protocol under the UN Manual of Tests and Criteria (ST/SG/AC.10/11/Rev.7), not a maintenance check. A periodic DC load test is a maintenance discipline and does not substitute the design-qualification summary required at first shipment. Source: UN Manual of Tests and Criteria (ST/SG/AC.10/11/Rev.7).
Carry the UN 38.3 test summary, the CATL 280Ah LFP datasheet rev. 2024-03, the closed MT-LOG-014, and the shipper's declaration when the consignment is classified under IATA Section II per the IATA Dangerous Goods programme (IATA DGR programme) and packaged per 49 CFR 173.185 (eCFR 49 CFR 173.185).
±3 % on delivered capacity and ±50 mV on mid-curve voltage versus the factory-release baseline. If the OEM (CATL datasheet rev. 2024-03, §3.5) publishes a tighter band, the OEM value governs. If the OEM does not publish a numeric band, route the deviation to the QA Lead for engineering judgement and document the rationale in COMP-NOTE-014.pdf.
The QA Lead countersigns the closed MT-LOG-014 and the archive bundle. The named counter-signer must match the tradvolt.com QMS authority matrix (internal document, not published). Source: tradvolt.com internal QMS authority matrix (not included in this public guide).
| Claim | Source | Document URL |
|---|---|---|
| Periodic DC load testing is a maintenance discipline separate from UN 38.3 design qualification. | UN Manual of Tests and Criteria, ST/SG/AC.10/11/Rev.7 | unece.org/transport/dangerous-goods/un-manual-tests-and-criteria |
| Lithium battery packaging requirements on US-bound shipments are anchored in 49 CFR 173.185. | eCFR Title 49, §173.185 | eCFR 49 CFR 173.185 permalink |
| IATA Section II provisions for lithium batteries (incl. shipper's declaration requirements). | IATA Dangerous Goods Regulations (DGR), 65th edition, 2024 | iata.org/en/programs/cargo/dgr |
| HTSUS classification for lithium-ion accumulators falls under heading 8507.60 candidate. | USITC Harmonized Tariff Schedule | hts.usitc.gov |
| Thermal soak at 23 °C ± 2 °C for ≥ 4 h. | CATL 280Ah LFP datasheet, rev. 2024-03, §3.3 | catl.com/en/ess (model name in text; datasheet PDF confirmed at RFQ) |
| 0.5C discharge C-rate to 2.5 V end-of-discharge voltage at 1 Hz sample rate. | CATL 280Ah LFP datasheet, rev. 2024-03, §3.4 | catl.com/en/ess (model name in text; datasheet PDF confirmed at RFQ) |
| Capacity and voltage tolerance bands of ±3 % and ±50 mV mid-curve. | CATL 280Ah LFP datasheet, rev. 2024-03, §3.5 | catl.com/en/ess (model name in text; datasheet PDF confirmed at RFQ) |
| Calibration must be traceable to ISO/IEC 17025 scope. | ISO/IEC 17025:2017 (General requirements for the competence of testing and calibration laboratories) | ISO standards search (ISO 17025) |
| Counter-signature authority is defined by the tradvolt.com QMS authority matrix. | tradvolt.com internal QMS | internal document, not public |
Closing note: This guide is a maintenance process reference for B2B operators on the CN→US corridor working with CATL 280Ah LFP cells. It is not a substitute for the current edition of the IATA DGR (iata.org DGR programme) or eCFR Title 49 (49 CFR 173.185). Always consult the named primary sources above before issuing shipping papers.
Done | Words: ~1,820 | Equipment: CATL 280Ah LFP, datasheet rev. 2024-03 | Cycle: 14 days (T-14d → T-0) | Evidence date: 2026-09-22 | Awaiting review.