Full cycle discharge no help

Discussion in 'iPhone' started by Kenjhee, Oct 8, 2012.

  1. Kenjhee macrumors regular

    Jan 30, 2011
    Just as an experiment, I wanted to test the theory of fully discharging the iPhone 5 battery to increase capacity. On its very first full discharge cycle, the phone went 1.8 days with 19% battery remaining (usage time was 7.7 hours), which extrapolates to 2.2 days for a full cycle. I then let the phone go completely to zero (auto-shutoff), and recharged all the way to 100%. Coming back down again, it logged 1.375 days with 32% battery remaining (usage time 6.0 hours), extrapolating to 2.0 days. This is slightly less than the pre-full cycle trial, though the diffference is probably within experimental error.

    So, according to this very unscientific study, I was not able to support the theory that the lithium battery inside an iPhone 5 is benefitted by fully discharging to zero.

    Comments welcome.
  2. andyblila macrumors 65816


    Jul 8, 2008
    On My iPhone, or my iPad?
  3. Kenjhee, Oct 8, 2012
    Last edited: Oct 8, 2012

    Kenjhee thread starter macrumors regular

    Jan 30, 2011
    LOL. I'm a scientist. ;)

    Note, some people say that the only reason for full discharge is to calibrate the battery. I'm not sure how to test that.

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