{
  "node": {
    "id": "term:reserve-capacity",
    "type": "Term",
    "label": "Reserve capacity",
    "properties": {
      "id": "reserve-capacity",
      "name": "Reserve capacity",
      "abbr": "RC",
      "section": "topic-other-chemistries",
      "definition": "A starter-battery rating: the minutes a fully charged 12 V battery can deliver 25 A at 27 °C before falling to 10.5 V. It describes how long the vehicle’s electrics run if the alternator fails.",
      "unit": "min",
      "related": [
        "cold-cranking-amps",
        "lead-acid",
        "nominal-capacity"
      ],
      "url": "https://lemonergy.com/learn/glossary/reserve-capacity/",
      "mentions": [
        "auxiliary-battery"
      ]
    }
  },
  "edges": [
    {
      "id": "edge:3626",
      "source": "term:reserve-capacity",
      "target": "topic:topic-other-chemistries",
      "type": "belongsTo",
      "properties": {
        "sourceFile": "terms.json"
      }
    },
    {
      "id": "edge:3627",
      "source": "term:reserve-capacity",
      "target": "term:cold-cranking-amps",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:3628",
      "source": "term:reserve-capacity",
      "target": "term:lead-acid",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:3629",
      "source": "term:reserve-capacity",
      "target": "term:nominal-capacity",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:mentions/reserve-capacity/auxiliary-battery",
      "source": "term:reserve-capacity",
      "target": "term:auxiliary-battery",
      "type": "mentions",
      "properties": {
        "sourceFile": "terms.json",
        "method": "build_glossary.mention_index + mentions",
        "field": "definition",
        "meaning": "Text mention; not a causal claim"
      }
    }
  ],
  "neighbors": [
    {
      "id": "topic:topic-other-chemistries",
      "type": "Topic",
      "label": "Other and emerging chemistries",
      "properties": {
        "id": "topic-other-chemistries",
        "name": "Other and emerging chemistries",
        "lede": "Batteries beyond today’s lithium-ion: lead, nickel and primary cells, flow and metal–air batteries, solid-state and lithium-metal cells, and the multivalent and sodium chemistries in development.",
        "context": "Do not carry lithium-ion assumptions into every chemistry.",
        "example": "Two chemistries can meet the same energy target with different voltage windows and charge termination.",
        "lesson_url": "https://lemonergy.com/learn/fundamentals/cell-anatomy/",
        "lesson_label": "Open cell anatomy"
      }
    },
    {
      "id": "term:cold-cranking-amps",
      "type": "Term",
      "label": "Cold cranking amps",
      "properties": {
        "id": "cold-cranking-amps",
        "name": "Cold cranking amps",
        "abbr": "CCA",
        "section": "topic-other-chemistries",
        "definition": "The rating of a starter battery: the current it can deliver for 30 seconds at −18 °C while staying above 7.2 V for a 12 V battery. It measures power in the cold, which is what starting an engine needs, not energy.",
        "unit": "A",
        "related": [
          "lead-acid",
          "reserve-capacity",
          "specific-power",
          "auxiliary-battery"
        ],
        "url": "https://lemonergy.com/learn/glossary/cold-cranking-amps/",
        "mentions": []
      }
    },
    {
      "id": "term:lead-acid",
      "type": "Term",
      "label": "Lead–acid battery",
      "properties": {
        "id": "lead-acid",
        "name": "Lead–acid battery",
        "section": "topic-other-chemistries",
        "definition": "The oldest rechargeable chemistry, lead and lead dioxide electrodes in sulfuric acid, at 2 V per cell. Heavy and short-lived in deep cycling but cheap, recyclable and good at cold cranking, it still starts most cars and backs up most telecom sites.",
        "related": [
          "nominal-voltage",
          "recycling",
          "specific-energy"
        ],
        "lesson": "labs/battery-materials-lab/#bml-market",
        "url": "https://lemonergy.com/learn/glossary/lead-acid/",
        "mentions": []
      }
    },
    {
      "id": "term:nominal-capacity",
      "type": "Term",
      "label": "Nominal capacity",
      "properties": {
        "id": "nominal-capacity",
        "name": "Nominal capacity",
        "aka": [
          "rated capacity"
        ],
        "section": "topic-ratings",
        "definition": "The charge a cell is rated to deliver under specified test conditions — current, temperature, rest and voltage limits — usually in ampere-hours.",
        "unit": "Ah",
        "related": [
          "ampere-hour",
          "c-rate",
          "capacity-test",
          "usable-capacity",
          "state-of-health"
        ],
        "lesson": "fundamentals/capacity-and-c-rate/#nominal-capacity",
        "url": "https://lemonergy.com/learn/glossary/nominal-capacity/",
        "mentions": []
      }
    },
    {
      "id": "term:auxiliary-battery",
      "type": "Term",
      "label": "Auxiliary battery",
      "properties": {
        "id": "auxiliary-battery",
        "name": "Auxiliary battery",
        "aka": [
          "12 V battery",
          "low-voltage battery"
        ],
        "section": "topic-pack",
        "definition": "The small 12 V or 48 V battery in an electric vehicle that powers the controllers, lights and locks and wakes the BMS, kept charged from the high-voltage pack through a DC/DC converter. A flat auxiliary battery immobilises the car however full the main pack is.",
        "related": [
          "dc-dc-converter",
          "lead-acid",
          "pack",
          "lin-bus"
        ],
        "url": "https://lemonergy.com/learn/glossary/auxiliary-battery/",
        "mentions": [
          "bms",
          "electric-vehicle"
        ]
      }
    }
  ]
}