{
  "node": {
    "id": "term:capacity-retention",
    "type": "Term",
    "label": "Capacity retention",
    "properties": {
      "id": "capacity-retention",
      "name": "Capacity retention",
      "section": "topic-aging",
      "definition": "Capacity measured now as a percentage of a reference capacity. Datasheets use it in two ways: after a number of cycles, against the initial capacity, which is how cycle life is defined; and at a low temperature, against the capacity at 25 °C, as in “at least 80 % at −20 °C”.",
      "related": [
        "capacity-fade",
        "cycle-life",
        "state-of-health",
        "end-of-life",
        "operating-temperature"
      ],
      "url": "https://lemonergy.com/learn/glossary/capacity-retention/",
      "mentions": []
    }
  },
  "edges": [
    {
      "id": "edge:belongsTo/term:capacity-retention/topic:topic-aging",
      "source": "term:capacity-retention",
      "target": "topic:topic-aging",
      "type": "belongsTo",
      "properties": {
        "sourceFile": "terms.json"
      }
    },
    {
      "id": "edge:relatedTo/term:capacity-retention/term:capacity-fade",
      "source": "term:capacity-retention",
      "target": "term:capacity-fade",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:relatedTo/term:capacity-retention/term:cycle-life",
      "source": "term:capacity-retention",
      "target": "term:cycle-life",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:relatedTo/term:capacity-retention/term:state-of-health",
      "source": "term:capacity-retention",
      "target": "term:state-of-health",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:relatedTo/term:capacity-retention/term:end-of-life",
      "source": "term:capacity-retention",
      "target": "term:end-of-life",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:relatedTo/term:capacity-retention/term:operating-temperature",
      "source": "term:capacity-retention",
      "target": "term:operating-temperature",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    }
  ],
  "neighbors": [
    {
      "id": "topic:topic-aging",
      "type": "Topic",
      "label": "Aging and degradation",
      "properties": {
        "id": "topic-aging",
        "name": "Aging and degradation",
        "lede": "Why a cell loses capacity and gains resistance, and the mechanisms behind it.",
        "context": "Separate mechanisms, observations and fitted models.",
        "example": "Capacity loss and resistance rise can have different causes; a film-growth curve cannot identify both.",
        "lesson_url": "https://lemonergy.com/learn/fundamentals/battery-aging/",
        "lesson_label": "Open aging"
      }
    },
    {
      "id": "term:capacity-fade",
      "type": "Term",
      "label": "Capacity fade",
      "properties": {
        "id": "capacity-fade",
        "name": "Capacity fade",
        "section": "topic-aging",
        "definition": "The loss of charge a cell can store and deliver, for example through lithium locked into the SEI or active material that has cracked out of service.",
        "related": [
          "loss-of-lithium-inventory",
          "loss-of-active-material",
          "state-of-health",
          "knee-point",
          "capacity-retention"
        ],
        "lesson": "fundamentals/battery-aging/#chain",
        "url": "https://lemonergy.com/learn/glossary/capacity-fade/",
        "mentions": [
          "active-material",
          "sei"
        ]
      }
    },
    {
      "id": "term:cycle-life",
      "type": "Term",
      "label": "Cycle life",
      "properties": {
        "id": "cycle-life",
        "name": "Cycle life",
        "section": "topic-ratings",
        "definition": "The number of full charge–discharge cycles a cell completes before its capacity falls to a stated fraction, usually 80 %, of its initial value under defined conditions. LFP cells reach several thousand cycles; high-energy NMC fewer.",
        "unit": "cycles",
        "related": [
          "end-of-life",
          "capacity-fade",
          "depth-of-discharge",
          "calendar-life",
          "equivalent-full-cycle",
          "cycle-life-test"
        ],
        "url": "https://lemonergy.com/learn/glossary/cycle-life/",
        "mentions": []
      }
    },
    {
      "id": "term:state-of-health",
      "type": "Term",
      "label": "State of health",
      "properties": {
        "id": "state-of-health",
        "name": "State of health",
        "abbr": "SOH",
        "section": "topic-state",
        "definition": "A summary of how far a cell has aged, often expressed through remaining capacity or increased resistance compared with when it was new. By convention a cell has reached end of life at 80 % of its rated capacity.",
        "unit": "%",
        "related": [
          "capacity-fade",
          "impedance-rise",
          "end-of-life",
          "remaining-useful-life",
          "state-of-charge",
          "state-of-certified-energy"
        ],
        "lesson": "fundamentals/capacity-and-c-rate/#real-cells",
        "url": "https://lemonergy.com/learn/glossary/state-of-health/",
        "mentions": [
          "nominal-capacity"
        ]
      }
    },
    {
      "id": "term:end-of-life",
      "type": "Term",
      "label": "End of life",
      "properties": {
        "id": "end-of-life",
        "name": "End of life",
        "abbr": "EOL",
        "section": "topic-state",
        "definition": "The point at which a cell no longer meets its application’s requirement, conventionally 80 % of initial capacity or a doubling of resistance. It is a definition for warranties and tests, not a point where the cell stops working.",
        "related": [
          "state-of-health",
          "beginning-of-life",
          "cycle-life",
          "second-life",
          "knee-point"
        ],
        "url": "https://lemonergy.com/learn/glossary/end-of-life/",
        "mentions": []
      }
    },
    {
      "id": "term:operating-temperature",
      "type": "Term",
      "label": "Operating temperature",
      "properties": {
        "id": "operating-temperature",
        "name": "Operating temperature",
        "section": "topic-ratings",
        "definition": "The temperature range a cell may be charged and discharged in, typically 0–45 °C for charging and −20–60 °C for discharging. Charging below 0 °C risks lithium plating; above the range the cell ages fast and may vent.",
        "unit": "°C",
        "related": [
          "lithium-plating",
          "arrhenius",
          "thermal-management",
          "datasheet"
        ],
        "lesson": "fundamentals/battery-aging/#temperature",
        "url": "https://lemonergy.com/learn/glossary/operating-temperature/",
        "mentions": []
      }
    }
  ]
}