Battery Calendar Life
The total lifespan of a battery regardless of usage, determined by chemical aging. Even an unused lithium-ion battery degrades over time, especially at high temperatures or extreme states of charge.
Why It Matters
Calendar life sets the upper bound on battery warranty. A 10-year warranty means the battery is expected to function for at least a decade, even if cycle life has not been exhausted.
Related Tools
Related Terms
Cycle Life
The number of complete charge-discharge cycles a battery can perform before its capacity drops below a specified threshold (typically 70-80% of original capacity).
Depth of Discharge (DoD)
The percentage of a battery's total capacity that is used during a discharge cycle. Most modern batteries allow 90-100% DoD.
State of Charge (SoC)
The current charge level of a battery expressed as a percentage of its total capacity, similar to a fuel gauge. 100% SoC means fully charged; 0% means fully discharged.