{
  "node": {
    "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": []
    }
  },
  "edges": [
    {
      "id": "edge:3621",
      "source": "term:cold-cranking-amps",
      "target": "topic:topic-other-chemistries",
      "type": "belongsTo",
      "properties": {
        "sourceFile": "terms.json"
      }
    },
    {
      "id": "edge:3622",
      "source": "term:cold-cranking-amps",
      "target": "term:lead-acid",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:3623",
      "source": "term:cold-cranking-amps",
      "target": "term:reserve-capacity",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:3624",
      "source": "term:cold-cranking-amps",
      "target": "term:specific-power",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:3625",
      "source": "term:cold-cranking-amps",
      "target": "term:auxiliary-battery",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; 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: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: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"
        ]
      }
    },
    {
      "id": "term:specific-power",
      "type": "Term",
      "label": "Specific power",
      "properties": {
        "id": "specific-power",
        "name": "Specific power",
        "aka": [
          "power density"
        ],
        "section": "topic-ratings",
        "definition": "Deliverable power per unit mass, in watts per kilogram; power density is the same per litre. A cell is designed for energy or for power, rarely both: thin electrodes give power, thick ones give energy.",
        "unit": "W/kg",
        "related": [
          "power",
          "specific-energy",
          "ragone-plot",
          "areal-loading",
          "power-cell-energy-cell"
        ],
        "url": "https://lemonergy.com/learn/glossary/specific-power/",
        "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"
        ]
      }
    }
  ]
}