Quote:
Originally Posted by NullNix
It's a safe bet that you're wrong, simply because the three-year extended warranty includes a free battery replacement, just as the Voyage's does: if they had to pay out on that a lot, they'd lose money. The Voyage battery definitely does not last eighteen years!
In practice, the Oasis's normal use pattern involves a lot of very shallow discharges of the case battery. I think I've gone below 40% only three or four times, and most of the time it's around 60--70% when it gets chucked back in the cover for another top-up. Li-ion batteries last a *lot* more charging cycles if the cycles are shallow. Really a lot more. High thousands to tens of thousands. "Effective infinity", in practice, because some other component will fail first...
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Lithium battery lifetime has two factors:
1. The number of charge cycles, as above.
2. A absolute lifespan somewhere around 5 years which is independent of the number of charge cycles. The clock starts ticking when the battery is first charged, and can't be stopped.
The second of these factors, not the first, is what will eventually kill the battery of any reader.