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Old 11-28-2014, 09:46 AM   #16
Anthem
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It'll start to lose capacity right from day 1.
Tangible capacity loss right from charge cycle number 1? Maybe in the most technical sense, yes. But from a practical point of view, you shouldn't notice any real capacity loss until you get several hundred cycles in. Unless the battery was manufactured improperly.

50% capacity on your iPhone after 4 1/2 years sounds about right. My old laptop that I recently retired hit about 4 1/2 years and then nose dived to only being able to hold around 25% capacity. For the first 3 1/2 years it kept an over 98% charge capacity based on my testing with the built-in battery testing utility in Ubuntu. Went downhill from there.
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Old 11-28-2014, 10:52 AM   #17
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Tangible capacity loss right from charge cycle number 1? Maybe in the most technical sense, yes. But from a practical point of view, you shouldn't notice any real capacity loss until you get several hundred cycles in. Unless the battery was manufactured improperly.
There are two factors which "age" a lithium battery: number of charge cycles, and a natural ageing process, whereby the internal resistance of the cells in the battery gradually increases. For a phone or a laptop, the charge cycles dominate, but for a reader, this is negligible: I doubt that many eInk devices get through as many as 10 charge cycles in a year. It's really only the "increasing internal resistance with age" factor that matters.
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Old 12-01-2014, 10:16 AM   #18
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There are two factors which "age" a lithium battery: number of charge cycles, and a natural ageing process...
This is true.

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For a phone or a laptop, the charge cycles dominate, but for a reader, this is negligible: I doubt that many eInk devices get through as many as 10 charge cycles in a year...
Agreed. And the OP asked specifically about length of time in storage and how to go about maximizing life based on that. NOT charge cycles. The Apple link I provided gives basic information about this topic in a simple and illustrated fashion.
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