{
  "node": {
    "id": "term:altitude-simulation-test",
    "type": "Term",
    "label": "Altitude simulation test",
    "properties": {
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      "name": "Altitude simulation test",
      "aka": [
        "low-pressure test",
        "UN 38.3 T1"
      ],
      "section": "topic-testing",
      "definition": "Storing cells or batteries at low air pressure to show they survive unpressurised air freight without leaking, venting or rupturing. UN 38.3 test T1 holds them at 11.6 kPa or less — the pressure at about 15 000 m — for at least six hours at room temperature.",
      "related": [
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      "id": "topic:topic-testing",
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      "label": "Testing methods",
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        "id": "topic-testing",
        "name": "Testing methods",
        "lede": "The measurements and test procedures that characterise a cell or pack, from capacity and pulse tests to abuse and environmental tests.",
        "context": "Record specimen, state, instrument, temperature and timing.",
        "example": "Resistance immediately after a current step can differ from a ten-second value because slower polarization contributes.",
        "lesson_url": "https://lemonergy.com/learn/fundamentals/capacity-and-c-rate/",
        "lesson_label": "Open capacity measurements"
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        "definition": "The United Nations test sequence that every lithium cell and battery must pass before it can be shipped: altitude, thermal cycling, vibration, shock, external short, impact or crush, overcharge and forced discharge. Air shipment of cells also caps state of charge at 30 %.",
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        "mentions": [
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      "id": "term:thermal-shock-test",
      "type": "Term",
      "label": "Thermal shock and cycling test",
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      "id": "term:venting",
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      "label": "Venting",
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        "section": "topic-safety",
        "definition": "The controlled release of gas and vapour from a cell whose internal pressure has risen too far, through a vent designed to open before the case bursts. The vented gas is flammable and toxic, so packs route it away from occupants.",
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      "label": "UN Manual of Tests and Criteria, Revision 8",
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        "publisher": "United Nations Economic Commission for Europe",
        "url": "https://unece.org/info/publications/pub/387256",
        "type": "Regulatory reference",
        "scope": "Dangerous-goods classification tests; subsection 38.3 concerns battery transport testing.",
        "year": 2023,
        "accessed": "2026-10-27"
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      "id": "reference:un-tests-amendment",
      "type": "Reference",
      "label": "Manual of Tests and Criteria, Revision 8, Amendment 1",
      "properties": {
        "title": "Manual of Tests and Criteria, Revision 8, Amendment 1",
        "publisher": "United Nations Economic Commission for Europe",
        "url": "https://unece.org/sites/default/files/2025-07/ST-SG-AC10-11-Rev8-Amend1e.pdf",
        "type": "Regulatory reference",
        "scope": "Amendments to Revision 8, including changes to battery testing in subsection 38.3.",
        "year": 2025,
        "accessed": "2026-10-27"
      }
    }
  ]
}