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A Li-ion battery 'charge' and a battery 'cycle' - What's the difference?

Discussion in 'Headphones, Earphones & Portable Music' started by shadowritten, Sep 17, 2005.

  1. shadowritten

    shadowritten
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    Been some discussion on here recently about the relative merits of Li-ion batteries and how long these last - both in general usage terms, and in overall usability lifespans. But what I want to know is, how does a battery CHARGE differ from a battery CYCLE?

    Anyone got some useful technical info to contribute?
     
  2. djpowell

    djpowell
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    According to Apple, a cycle is equivalent to a complete charge and discharge, but it can be broken over several several charges, so if you use half the charge, then recharge it, then use half the charge again, and recharge it, that is only one charge cycle.

    http://www.apple.com/batteries/
     
  3. KiNeL

    KiNeL
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  4. shadowritten

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    Thanks for the info so far, guys.

    So, let's see if I understand correctly. If I charge my player all the way to the max, then discharge it all the way to the ... er ... min, that's one cycle, right? But I can have serval 'part cycles', as it were, before completing a full cycle? Which begs the question: How many charge cycles does, say, the HD5's battery give me?
     
  5. Cloysterpeteuk

    Cloysterpeteuk
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    Most are rated for around 500.
     
  6. KiNeL

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    Hence the general advice to top up every time and not fully discharge/recharge.

    10 x 10% top ups = 1 charge
    4 x 25% top ups = 1 charge
    etc. etc.

    Confusingly exactly the opposite to that for NiCad and NiMh!
     
  7. shadowritten

    shadowritten
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    Sounds like I'm doing the best thing by my battery, then - normally top up when there's about 30% remaining charge. In fact, I don't think I've charged it more than about 10-20 times since July! Ridiculously long battery life! Also, I generally don't bother using the AC adaptor when adding a handful of CDs - and it still seems to soldier on for days afterwards ... :clap:
     
  8. KiNeL

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    Apart from the very first charge I have not used my AC charger since.

    The USB charge it gets when I upload or delete music seems to be quite sufficient.

    Wondering now if I needed to buy the that spare battery after all but I'm sure it will come in useful on longer trips.
     
  9. shadowritten

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    My 10-20 recharges include several via USB. I've been surprisingly impressed by the HD5's USB charging efficiency - beats the hell out of the Zen Touch's ...
     

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