Quote:
Originally Posted by Braid
The total amount of battery time is important, of course. But I've been thinking just now, that what really matters just as much, is the issue of how accurately the battery life is displayed by the reader's firmware.
If the remaining battery amount is displayed accurately and reliably, then I don't need to worry about it. Nobody reads for 14 hours without taking a break, and during a break you can easily plug in the reader to charge.
It is inaccurate, inconsistent readings of remaining battery that are what causes real problems, in my view.
I've used devices (not my Kindle Voyage), whose battery readings decrease slowly and steadily from 100% down to 60%, then they decrease quicker from 60% down to 30%. I'm thinking, "well, I got several hours from 100% down to 70%, so I should have at least a couple of hours left in this 30%". But then the battery cuts out soon after, interrupting my using the device. So essentially, I can only confidently use the device when it is charged above 70% - anything below that and I can't feel confident about how long it will last.
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That is the normal discharge curve for the type of battery installed.
Quote:
Originally Posted by Braid
All of the Kindle and Kobo devices I've used (except the Aura One) have consistently displayed the gradual decrease in battery life in a way that makes me feel confident about when I can keep reading, and when I'll need to top up in between reading sessions.
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Those are the ones that are technically inaccurate but compute a more useful indication. I.E: They include discharge curve correction.
Also the curve from 100% .. 65% compared to the curve from 65% to 30% varies with use history and age.
With lit-ion, recharge early (don't let it go below 30%) and recharge often (don't it go above 70%).
The battery management chip in the Kindle is pretty sophisticated, but nothing as good as the one in your electric car with a $12,000 battery.