# Charge cycle

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Charging and discharging a battery

A **charge cycle** is the process of [charging](/source/Battery_charger) a [rechargeable battery](/source/Rechargeable_battery) and discharging it as required into a [load](/source/Electrical_load). The term is typically used to specify a battery's expected life, as the number of charge cycles affects life more than the mere passage of time. Discharging the battery fully before recharging may be called "deep discharge"; partially discharging then recharging may be called "shallow discharge".

A "charge cycle" is not a unit of time; the length of time spent charging or discharging does not affect the number of charge cycles.[1] Each battery is affected differently by charge cycles.[2][3]

In general, number of cycles for a rechargeable battery (the **cycle life**) indicates how many times it can undergo the process of complete charging and discharging until failure or starting to lose capacity.[4][5][6][7]

[Apple Inc.](/source/Apple_Inc.) clarifies that a charge cycle means using all the battery's capacity, but not necessarily by discharging it from 100% to 0%: "You complete one charge cycle when you’ve used (discharged) an amount that equals 100% of your battery’s capacity — but not necessarily all from one charge. For instance, you might use 75% of your battery’s capacity one day, then recharge it fully overnight. If you use 25% the next day, you will have discharged a total of 100%, and the two days will add up to one charge cycle."[8]

## See also

- [Deep-cycle battery](/source/Deep-cycle_battery)

## References

1. **[^](#cite_ref-1)** Preger, Yuliya; Barkholtz, Heather M.; Fresquez, Armando; Campbell, Daniel L.; Juba, Benjamin W.; Romàn-Kustas, Jessica; Ferreira, Summer R.; Chalamala, Babu (1 August 2022). ["Degradation of Commercial Lithium-Ion Cells as a Function of Chemistry and Cycling Conditions"](https://doi.org/10.1149%2F1945-7111%2Fabae37). *Journal of the Electrochemical Society*. **167** (12): 120532. [doi](/source/Doi_(identifier)):[10.1149/1945-7111/abae37](https://doi.org/10.1149%2F1945-7111%2Fabae37). [S2CID](/source/S2CID_(identifier)) [225506214](https://api.semanticscholar.org/CorpusID:225506214).

1. **[^](#cite_ref-2)** ["Understanding the Trilemma of Fast Charging, Energy Density and Cycle Life of Lithium-ion Batteries"](https://www.osti.gov/servlets/purl/1474853). 1 August 2022.

1. **[^](#cite_ref-3)** ["Powerstation im Test"](https://mytravel-magazin.de/produkte/beste-powerstation-test/) (in German). 1 August 2022.

1. **[^](#cite_ref-Bove2010_4-0)** Tony Bove (2 February 2010). [*iPod & iTunes For Dummies, Book + DVD Bundle*](https://books.google.com/books?id=hASIU1Z3HVAC&pg=PA26). John Wiley & Sons. p. 26. [ISBN](/source/ISBN_(identifier)) [978-0-470-59070-6](https://en.wikipedia.org/wiki/Special:BookSources/978-0-470-59070-6). Retrieved 19 June 2013.

1. **[^](#cite_ref-George2007_5-0)** G. S. George (1 January 2007). *Applied Science II*. Technical Publications. p. 8. [ISBN](/source/ISBN_(identifier)) [978-81-8431-146-4](https://en.wikipedia.org/wiki/Special:BookSources/978-81-8431-146-4).

1. **[^](#cite_ref-Nations2009_6-0)** United Nations (2009). *Recommendations on the Transport of Dangerous Goods: Manual of Tests and Criteria*. United Nations Publications. p. 394. [ISBN](/source/ISBN_(identifier)) [978-92-1-139135-0](https://en.wikipedia.org/wiki/Special:BookSources/978-92-1-139135-0).

1. **[^](#cite_ref-Andrea2010_7-0)** Davide Andrea (2010). [*Battery Management Systems for Large Lithium Ion Battery Packs*](https://books.google.com/books?id=o-QpFOR0PTcC&pg=PA189). Artech House. p. 189. [ISBN](/source/ISBN_(identifier)) [978-1-60807-105-0](https://en.wikipedia.org/wiki/Special:BookSources/978-1-60807-105-0). Retrieved 19 June 2013.

1. **[^](#cite_ref-8)** [Batteries - Why Lithium-ion? - Apple](https://www.apple.com/batteries/why-lithium-ion/)

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Adapted from the Wikipedia article [Charge cycle](https://en.wikipedia.org/wiki/Charge_cycle) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Charge_cycle?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.