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Originally Posted by webjunk
We go back again to relevance. The decrease is irrelevant for battery life - we are talking battery life, not how many hours reading you get at certain points. The biggest factor in reading time is how you read. Faster, slower than average, font size, look ups...
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Excellent point, I agree. And I thought we were discussing reading time as an implied way of determine battery discharge. I don't think people normally talk about "I read .2 cycles per day", they will say something like "I read 6 hours a day, and I'm down to 20% battery left, and I do a full recharge" (which would be .8 of a cycle a day).
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... You need to back to your source material and read it again and apply relevance to yourself and to your device.
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I did that, I provided the link so people could check my assumptions. All you did was say things like "anyone can do the math" and "500 days equals 500 charges" and "the battery doesn't start to degrade until after 500 charges". Not very helpful (or accurate) in my opinion.
So as an example. One starts reading on day 1, on day one they read for 6 hours, and they have 20% battery life left. So...
for this mythical reader, the initial "capacity" of the battery is 7.5 hours of reading time.
After one year, they are down to 6.3 hours of capacity, and gone through 318 cycles - not looking to good, can't go through one day of reading without recharging (if one must stick to your rule of not abusing the battery)
After 2 years, they are down to 4.8 hours of reading capacity, and gone through 713 cycles - That is a lot of cycles
After three years, capacity is down to 2.6 hours, and you've gone through 1294 cycles
Now let say same someone increases their reading time to 8 hours a day...
After one year, they are down to 5.9 hours of capacity (per cycle), and gone through 449 cycles
After two years, they are down to 3.5 hours of capacity and gone through 1058 cycles (what is the expected number of cycles for the life of the battery)
After 2.5 years you are down to 1.24 hours of capacity and gone through 1650 cycles
YRTMV (Your reading times may vary).