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Old 05-04-2012, 07:06 AM   #9
HarryT
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Join Date: Nov 2006
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Quote:
Originally Posted by danskmacabre View Post
How is that calculated?
From what I have read you can get 500-800 charges out of a Lithium battery.
If you have to recharge your ereader say every 2 weeks (about how often I have to recharge my Kobo Touch), that means it should last for (base it on the lower 500 charges end) that's theoretically 18 years..
No, there are two factors at work.

1. As you rightly say, there is a factor of the number of charge cycles.

But...

2. A Lithium battery also has a natural lifespan of about 5 years regardless of how often it is or isn't charged. The clock starts ticking when the battery is first charged, and nothing will halt it.

For a laptop, which is charged daily, factor 1 generally outweighs factor 2, but for an eInk reader, factor 2 completely dominates. Your battery almost certainly WILL die in about 5 years, regardless of how little or how often you recharge it.
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