Battery life is measured in number of charge-discharge cycles. Charge Cycle wiki says

Apple Inc. clarifies that a charge cycle means using all the battery's capacity, but not necessarily by full charge and discharge; e.g., using half the charge of a fully charged battery, charging it, and then using the same amount of charge again count as a single charge cycle"

This definition seems to be Apple oriented. My question is

Does Android follow the same definition or is there a different definition ?

Asking since I have both an iPad and Android (Samsung Galaxy) and was wondering if battery life is measured similarly or differently.

  • Plenty of references in our charging tag-wiki (especially check the "Handling" and "Maintenance" sections there).
    – Izzy
    Feb 29, 2016 at 7:05

1 Answer 1


AFAIK I know there isn't any Android specific definition (would welcome corrections from others). Having said that, industry seems to treat this metric differently.

Wikipedia definition implies 100% discharge to count as one cycle, where as industry seems to treat 80% discharge to count as one cycle per sources below

Cycle Life:  The capacity of a rechargeable cell or battery changes over its life. The definition of the battery life or cycle life of a battery is number of cycles that a cell or battery can be charged and discharged under specific conditions, before the available capacity falls to a specific performance criteria - normally 80% of the rated capacity

A discharge/charge cycle is commonly understood as the full discharge of a charged battery with subsequent recharge, but this is not always the case. Batteries are seldom fully discharged, and manufacturers often use the 80 percent depth-of-discharge (DoD) formula to rate a battery. This means that only 80 percent of the available energy is delivered and 20 percent remains in reserve. Cycling a battery at less than full discharge increases service life, and manufacturers argue that this is closer to a field representation than a full cycle because batteries are commonly recharged with some spare capacity left.

There is no standard definition as to what constitutes a discharge cycle (....)

To summarise, Wikipedia definition seems academic while industry treats it practically

(Aside, Charge Cycle Counter, which measures battery charge cycles follows Wikipedia definition )

Why I presume Android follows industry definition

Apart from the two reasons mentioned above for 80% discharge to be measured as one cycle (namely, real life charging and better battery life ), I suspect that battery manufactures would prefer this as it boosts battery life cycle count by 20% compared to Apple/Wikipedia definition.

  • Glad it helped :)
    – beeshyams
    Mar 1, 2016 at 6:45

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