Everytime i sync with itunes, iphone also get charged, because of numbers of complaint about battery life, i wanted to stop the charging process, as in some Pocket PC devices we can choose to stop USB charging function (toogle on or off) is there anyway we can use this kind of method on iphone?

thanks for helpin me out

I wonder if the battery would last longer if we keep the phone topped up (ie, charge every night), rather than let it run down heaps, then charge it.

That's what I've been doing anyway (charging every night).

From my experience, it doesn't matter if the battery is NiMH, NiCad, Lithium-Ion or any combination of materials; the cleanest way to use them is always the same: Full charge/discharge cycles!

Avoid charge, until complete discharge or small leftovers of charge before full charge.

Even the best quality batteries suffer the "memory effect"

Cheers!

Originally Posted by Probo

From my experience, it doesn't matter if the battery is NiMH, NiCad, Lithium-Ion or any combination of materials; the cleanest way to use them is always the same: Full charge/discharge cycles!

Avoid charge, until complete discharge or small leftovers of charge before full charge.

Even the best quality batteries suffer the "memory effect"

Cheers!

Well, I don't know about your experiences, but the battery in the iPhone is not in any way affected by memory affect. It's not a matter of a high quality battery, this battery uses a different method of storing electricity that is not affected by the short charge cycles.

But guess what does harm the iphone's battery? Heat. Long charge cycles are actually killing your iphone's battery because the heat buildup is much more than with nightly short charges. So I would suggest allowing your iPhone to charge whenever possible. I've been doing it for the last 3 months and my battery actually performs better than when I took it out of the box, believe it or not .

Originally Posted by Probo

From my experience, it doesn't matter if the battery is NiMH, NiCad, Lithium-Ion or any combination of materials; the cleanest way to use them is always the same: Full charge/discharge cycles!

Avoid charge, until complete discharge or small leftovers of charge before full charge.

Even the best quality batteries suffer the "memory effect"

Cheers!

Not too sure about that, I happen to work on PDA phones 8125, 8525, Treo 750, ATT Tilt ect. From what I have noticed is people that drain their Lithium-Ion batteries below 30% before charging tend to need to buy new batteries after 6 to 12 months. I still have phones with Lithium-ion around 2 years old never let them dishcharge more than 50% and have never had to buy another battery.

This is just my experience, but I do see alot of phones and people buying batteries, and usually will ask their charging habits.

Try using a bus powered USB Hub (Example: A USB hub that does not plug into external power or use batteries). The iPhone should still be able to sync, but it will not provide power to charge.

eh... It actually depends on the charge logic built into the device....in this case, the iPhone. Most devices I know supercharges the battery to near full charge and then trickle charges it to 100%. Also, this charge level is determined by its capacity, which deteriorates over time. The chemicals within the cells also deteriorate over time. Nothing we can do about that. And yes, it DOES matter if the QUALITY is good or not so good. Li-Ion, Li-po, etc have high grade and not-so-high grade. I think the iPhone charge logic is a good one, considering the fact that Apple has learned a lot from their iPods and their users!

Originally Posted by thecompkid

Well, I don't know about your experiences, but the battery in the iPhone is not in any way affected by memory affect. It's not a matter of a high quality battery, this battery uses a different method of storing electricity that is not affected by the short charge cycles.

But guess what does harm the iphone's battery? Heat. Long charge cycles are actually killing your iphone's battery because the heat buildup is much more than with nightly short charges. So I would suggest allowing your iPhone to charge whenever possible. I've been doing it for the last 3 months and my battery actually performs better than when I took it out of the box, believe it or not .

Good point... you're right, the heat kill any kind of batteries!

Originally Posted by viper

Not too sure about that, I happen to work on PDA phones 8125, 8525, Treo 750, ATT Tilt ect. From what I have noticed is people that drain their Lithium-Ion batteries below 30% before charging tend to need to buy new batteries after 6 to 12 months. I still have phones with Lithium-ion around 2 years old never let them dishcharge more than 50% and have never had to buy another battery.

This is just my experience, but I do see alot of phones and people buying batteries, and usually will ask their charging habits.

The batteries technology has been improved a lot in a very short time... that's why we can't "see" the effects as we used to see it a few time ago... am just saying what I saw in my experience...

Originally Posted by Gibberish

eh... It actually depends on the charge logic built into the device....in this case, the iPhone. Most devices I know supercharges the battery to near full charge and then trickle charges it to 100%. Also, this charge level is determined by its capacity, which deteriorates over time. The chemicals within the cells also deteriorate over time. Nothing we can do about that. And yes, it DOES matter if the QUALITY is good or not so good. Li-Ion, Li-po, etc have high grade and not-so-high grade. I think the iPhone charge logic is a good one, considering the fact that Apple has learned a lot from their iPods and their users!

Right, am agree...! I didn't mention anything about the charging circuit 'cause it's obvious for me that the phone manage the charging process; but the chemical process it's an independent thing... that's where my comment resides...

Cheers to all!

Originally Posted by virtue

Everytime i sync with itunes, iphone also get charged, because of numbers of complaint about battery life, i wanted to stop the charging process, as in some Pocket PC devices we can choose to stop USB charging function (toogle on or off) is there anyway we can use this kind of method on iphone?

thanks for helpin me out

I am surprised that no one actually answered the original question: How to stop USB charging?

No one wondered that someone might be using a laptop on the go and using the iPhone to connect to the internet by tether while the iPhone drains the laptop battery?

There is no known way to disallow charging over the dock connector while the machine is plugged into a powered USB port. On the iPad, you can do this by mucking with the cable and putting a current limiter in line, as the iPad can only charge over USB if the USB port is outside of RFC spec and allows higher amperage than it should. If you limit the amperage to RFC spec, the iPad will show as plugged in but 'Not charging'. This happens on most PCs because PC manufacturers and USB chipset makers for the PC have more regard for open and accepted standards than Apple seems to.