Specific energy

Example

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Use in Lemonergy

Separate nameplate ratings from test results.

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Learn it in Lesson 2 · Capacity and C-rate →

Connected concepts

Related concepts from the knowledge graph. Connections show context, not cause and effect. Hover or focus a linked term for its definition.

Cell-to-pack ratio

The share of a pack’s mass or volume that is cells rather than housing, cooling, busbars and electronics. It is typically 60–75 % by mass; raising it is the point of cell-to-pack and cell-to-chassis designs.

Energy density

Stored energy per unit volume, in watt-hours per litre. It is the figure that matters when space is the constraint, as in a phone or under a car floor; high-energy cylindrical cells pass 700 Wh/L.

Ragone plot

A log–log chart of specific power against specific energy on which each storage technology occupies a region. Capacitors sit high and left, batteries lower and right, and a single cell traces a curve as it is discharged faster.

Specific capacity

Charge stored per gram of active material, in mAh/g. It is the figure materials scientists quote: about 150–200 mAh/g for layered oxides, 160 for LFP, 372 theoretical for graphite and about 3600 for silicon.

References & further reading

Further reading on this topic

These sources provide broader context; they are not presented as citations for every statement in this entry.

1. The International System of Units (SI), 9th edition

   Bureau International des Poids et Mesures · 2026

   Topic background · Definitions of SI units and coherent derived units; 2026 revision.

2. Battery Test Manual For Electric Vehicles, Revision 3

   Jon P. Christopherson · Idaho National Laboratory · 2015

   Topic background · Performance characterization, pulse resistance/power, life testing and reference performance tests; historical 2015 edition.