{ "node": { "id": "term:service-life", "type": "Term", "label": "Service life", "properties": { "id": "service-life", "name": "Service life", "aka": [ "runtime" ], "section": "topic-ratings", "definition": "The total time a battery stays useful in its application, set by whichever of calendar life and cycle life runs out first. Runtime, by contrast, is the time a single charge lasts under a given load.", "related": [ "calendar-life", "cycle-life", "end-of-life", "warranty" ], "url": "https://lemonergy.com/learn/glossary/service-life/", "mentions": [] } }, "edges": [ { "id": "edge:3592", "source": "term:service-life", "target": "topic:topic-ratings", "type": "belongsTo", "properties": { "sourceFile": "terms.json" } }, { "id": "edge:3593", "source": "term:service-life", "target": "term:calendar-life", "type": "relatedTo", "properties": { "sourceFile": "terms.json", "meaning": "Related context; not a causal claim" } }, { "id": "edge:3594", "source": "term:service-life", "target": "term:cycle-life", "type": "relatedTo", "properties": { "sourceFile": "terms.json", "meaning": "Related context; not a causal claim" } }, { "id": "edge:3595", "source": "term:service-life", "target": "term:end-of-life", "type": "relatedTo", "properties": { "sourceFile": "terms.json", "meaning": "Related context; not a causal claim" } }, { "id": "edge:3596", "source": "term:service-life", "target": "term:warranty", "type": "relatedTo", "properties": { "sourceFile": "terms.json", "meaning": "Related context; not a causal claim" } }, { "id": "edge:3597", "source": "term:service-life", "target": "visual:health", "type": "illustratedBy", "properties": { "sourceFile": "visual-pages.json" } } ], "neighbors": [ { "id": "topic:topic-ratings", "type": "Topic", "label": "Capacity, energy, power and ratings", "properties": { "id": "topic-ratings", "name": "Capacity, energy, power and ratings", "lede": "The numbers that size a cell and let two cells be compared.", "context": "Separate nameplate ratings from test results.", "example": "5 Ah at 3.6 V gives 18 Wh nominally. Integrated measured terminal power may give a different result.", "lesson_url": "https://lemonergy.com/learn/fundamentals/capacity-and-c-rate/", "lesson_label": "Open capacity and C-rate" } }, { "id": "term:calendar-life", "type": "Term", "label": "Calendar life", "properties": { "id": "calendar-life", "name": "Calendar life", "aka": [ "shelf life" ], "section": "topic-ratings", "definition": "How long a cell lasts in years, regardless of cycling, before it reaches its end-of-life criterion. It is set by calendar aging, which runs fastest at high temperature and high state of charge.", "unit": "years", "related": [ "calendar-aging", "cycle-life", "end-of-life", "self-discharge", "calendar-life-test" ], "url": "https://lemonergy.com/learn/glossary/calendar-life/", "mentions": [ "state-of-charge" ] } }, { "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: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:warranty", "type": "Term", "label": "Battery warranty", "properties": { "id": "warranty", "name": "Battery warranty", "section": "topic-applications", "definition": "The manufacturer’s guarantee of capacity retention over time, for electric cars typically 70 % after 8 years or 160 000 km. It is written against state of health as the BMS reports it, which makes the SOH algorithm a contractual matter.", "related": [ "state-of-health", "end-of-life", "calendar-life", "cycle-life", "throughput-limiting" ], "url": "https://lemonergy.com/learn/glossary/warranty/", "mentions": [ "bms", "state-of-capacity" ] } }, { "id": "visual:health", "type": "Visual", "label": "Capacity loss and resistance growth", "properties": { "title": "Capacity loss and resistance growth", "summary": "Energy capability and power capability can degrade differently.", "readout": "At the illustrated endpoint: 80% initial capacity and 140% initial resistance.", "formula": "Capacity ratio = Q_now/Q_initial; resistance ratio = R_now/R_initial", "note": "Chosen qualitative trends. The exposure axis is not predicted cycles or years.", "software": { "status": "reference", "label": "Reference concept", "body": "battery-core supplies individual aging relationships, not a calibrated SOH or remaining-life estimator. The selected trends are illustrations and do not predict cycles or years.", "href": "../fundamentals/battery-aging/" }, "html": "
Chosen degradation trends
Chosen degradation trendsRelative life exposure versus Relative to beginning of life (%). Capacity retained; Resistance. Interpretation follows the graphs.50087.50.251250.51630.752001Relative life exposureRelative to beginning oflife (%)
Capacity retainedResistance (dashed)
" } } ] }