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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!
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I didn't realize that. Good information. However, it doesn't really change the calculation.
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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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If you read the section on caring for lithium ion batteries at:
http://batteryuniversity.com/learn/a...ased_batteries
you'll see that they agree that shallow discharging cycles make a difference, as you say, but not nearly as much as you describe. It might be enough to throw my calculations off by 20% or so but these are all ballpark numbers anyway so I don't think that's enough to matter.
Barry