Battery knowledge · Capacity, energy, power and ratings
Calendar life
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.
- Also called
- shelf life
- Unit
- years
Example
Diffusion-limited film growth
At four reference time units, thickness is 2× the reference thickness.
Normalized analytical relation, not a capacity-loss or SOH prediction.
Explore the graph
Four times the elapsed time gives twice the film thickness in this model.
At four reference time units, thickness is 2× the reference thickness.
δ / δ_ref = √[(t / t_ref) A]
Illustrative model. Normalized analytical relation, not a capacity-loss or SOH prediction.
Use in Lemonergy
Separate nameplate ratings from test results.
This is a reference concept. No executable Lemonergy block has been verified for this term.
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.
- 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.
- 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.