Charge cycle

A charge cycle is the process of charging a rechargeable battery and discharging it as required into a 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".

Each charge cycle can depend on how long it takes to be completed. Each battery is affected differently by charge cycles.

In general, number of cycles for a rechargeable battery indicates how many times it can undergo the process of complete charging and discharging until failure or it starting to lose capacity.[1][2][3][4]

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."[5]

See also

References
  1. Tony Bove (2 February 2010). iPod & iTunes For Dummies, Book + DVD Bundle. John Wiley & Sons. p. 26. ISBN 978-0-470-59070-6. Retrieved 19 June 2013.
  2. G. S. George (1 January 2007). Applied Science II. Technical Publications. p. 8. ISBN 978-81-8431-146-4. Retrieved 19 June 2013.
  3. United Nations (2009). Recommendations on the Transport of Dangerous Goods: Manual of Tests and Criteria. United Nations Publications. p. 394. ISBN 978-92-1-139135-0. Retrieved 19 June 2013.
  4. Davide Andrea (2010). Battery Management Systems for Large Lithium Ion Battery Packs. Artech House. p. 189. ISBN 978-1-60807-105-0. Retrieved 19 June 2013.
  5. Batteries - Why Lithium-ion? - Apple


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