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Is this normal? 1 hour of playing.

janner43

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Thank you VERY MUCH for posting that link and info. It is good to see Apple publishing that publicly.

So if we redo the math using 1000, that means in 7.5 months you will see your time drop from 10 hours to 9.5 hours. Which is a heck of a lot better than my example :)

No problem :) I've written the same sort of posts as you did earlier on an Android forum trying to help folks who worry about their batteries. As you say, you can't change the "laws" that govern these things & lithium batteries last much better if you charge them "little & often" rather than deep cycling them.

The heat generated when charging a lithium battery, especially if it is being used to drive a screen (ie being used when charged), can be quite astonishing. Charging from 50% to 100% twice, generates a lot less "wear" on a lithium battery than one single charge from say 3% to 100%.

There are some interesting reports out there that suggest that battery life can be improved by quite a bit if you recharge at a discharge level of 40-60%

:)
 
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AdmiralAdama

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janner43 said:

It's the expression for Half-life (t½). How long it takes for something to be reduced to one half of its value over time.
Normally it's used to describe the rate of radioactive decay.

In other words, I was just being a smart alec. ;) One of my many character flaws I'm afraid.

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janner43

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It's the expression for Half-life (t½). How long it takes for something to be reduced to one half of its value over time.
Normally it's used to describe the rate of radioactive decay.

In other words, I was just being a smart alec. ;) One of my many character flaws I'm afraid.

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Not a problem :), I wondered - which is why I asked :)

My Science Education ended at 16 - my Math got to 18. Then I joined the world of commerce & learned that a little knowledge & a friendly smile can get you a long way & help others to teach you what you didn't know. Or, as I used to teach my sales staff, "you have 2 ears & one mouth - guess which you should use more". :)

And anyway, I could never fall out with a fellow SF fan... :)
 

AdmiralAdama

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janner43 said:
Not a problem :), I wondered - which is why I asked :)

My Science Education ended at 16 - my Math got to 18. Then I joined the world of commerce & learned that a little knowledge & a friendly smile can get you a long way & help others to teach you what you didn't know. Or, as I used to teach my sales staff, "you have 2 ears & one mouth - guess which you should use more". :)

And anyway, I could never fall out with a fellow SF fan... :)

Agreed. :)

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twerppoet

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So as you use your device on simply a daily basis, if you discharge it once a day, you could see a battery life difference of 25% in just over 3 months.

Just a quibble:

Three months of one full discharge a day would only be between 90 to 93 cycles. If the battery degrades at the expected rate (given your 400 cycle example) that would be less than a 5% loss of capacity.
 
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Skull One

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Just a quibble:

Three months of one full discharge a day would only be between 90 to 93 cycles. If the battery degrades at the expected rate (given your 400 cycle example) that would be less than a 5% loss of capacity.

That depends on the math. 25% of 2 hours is 30 minutes. Which was the point of my example.
 

AdmiralAdama

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twerppoet said:
Sorry.

So you meant 25% of the 20% (2 hours) that you could expect to loose over the 400 cycles? That makes my head hurt. ;)

The both of you rattling this stuff off like it's the alphabet makes my head hurt. ;) I bow to your computation awesomeness.

Hey you guys aren't Cylons are you?

:)

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Skull One

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Sorry.

So you meant 25% of the 20% (2 hours) that you could expect to loose over the 400 cycles? That makes my head hurt. ;)

Actually I thought about doing the math straight up like you laid out but I wanted to give a sense of how much of an impact is really happening if you think a battery should be replaced once it hits 80% of capacity. On an iPhone 4S the difference between new and 300 cycle later is very dramatic. Well over an hour of usage is lost.

But I was glad to see the newer iPads are at 1000 cycles. For me that means I should get more than 4 years of use before I hit 500 cycles (recharge every three days).
 

Skull One

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