Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
I wanted to start this thread because of the lack of knowledge people have about a lithium ion battery compared to the older ni-cad battery.

First The is lithium ion batteries DO NOT develop a memory so people thinking you should drain your battery till it is almost dead and then charge it because of the "memory" of the battery are wrong.

Second The charge cycle for a iPhone battery is from dead to fully charged. So charging your battery often means many less full cycles. A lithium-ion battery provides 300-500 discharge/charge cycles. The battery prefers a partial rather than a full discharge. Frequent full discharges should be avoided when possible. Instead, charge the battery more often. There is no concern of memory when applying unscheduled charges.

A lithium-ion battery in use typically lasts between 2-3 years. The worst condition is keeping a fully charged battery at elevated temperatures, which is more a problem with running laptop batteries. If used on main power, the battery inside a laptop will only last for 12-18 months.

So again:

Avoid frequent full discharges because this puts additional strain on the battery. Several partial discharges with frequent recharges are better for lithium-ion than one deep one. Recharging a partially charged lithium-ion does not cause harm because there is no memory. (In this respect, lithium-ion differs from nickel-based batteries.)

Keep the lithium-ion battery cool. Avoid a hot car. For prolonged storage, keep the battery at a 40% charge level.

I Hope this sheds some light on the subject. If you do not believe me please feel free to research it yourself.


My only concern is what Apple says about recharging the lithium ion on their laptops. They say a regular basis to drain the battery completely and recharge fully. Wouldn't the same principles apply to the iphone?
 
in the sense that you shouldnt charge them to full capacity?? or you shouldnt leave them on full charge for extended periods of time?

I've read for the longest battery life in the iPhone to keep it between 20% and 80% capacity with frequent charges to keep it between that area.

I usually just throw it on the charger in the car, getting about 15-20 minutes of juice a couple times per day, then of course if I need some in the morning when I'm in the shower or something. I usually don't charge the phone for more than a half hour at a time.

My battery life has been better, and i have done the same with my MacBook with the same results. Seems to really work.

I tried finding the article, but I couldn't... I think it was on Engadget but I really don't remember.
 
Ok so I have a car charger for my iphone. Does this mean that it is actually a smart idea, to pop it in the charger whenever i get into the car?

Sorry guys, its important.

From what I've read, yes. That's exactly what I do. Sorry I didn't see your quote earlier or I would have included it in my prior response.
 
While it is true that you should avoid as best you can letting the iphone's battery run all the way down, (by all the way, I mean to the 20% or 10% warning):

1) In real world use, there will be times when despite your efforts it does run down to 20%, 10% or all the way, as long as you don't make a habit of it, and try as best you can to avoid it, your battery will be OK, its OK if it happens here and there, long as it's not running all the way down too often. Just do your best to prevent it from happening by charging the battery whenever you get a chance, as was said, no worries about memory effect.

2) You are supposed to, about once a month, let it run all the way down until it shuts itself off and says to charge it, then, charge it fully and undisturbed, like for 4-5 hours or so, this calibrates the battery's charge meter and gives you a more accurate power remaining indicator. Keep in mind, the battery gets to a 90% full charge relatively quickly, about 2 hours, but takes another 2 hours to get the last 10%, so, it may look fully charged in 2 hours, but generally it's not, unless it has been charging for about 4 hours, so, when doing your once a month calibration full discharge/full recharge, don't unplug it prematurely, make sure the lightning bolt inside the little battery icon has changed into a plug.

3) You can't overcharge the battery, once it reaches full charge, it stops charging the battery, there's no danger letting it charge overnight.
 
Here is what I want to know: is it better to charge your battery to 100% (regardless of where the charge was at - 10%, 50%, 80%), or is it ok to charge it to whatever level you want, and will that type of behavior have any long term effects on the health of the battery?

To be more specific: does it hurt the battery if you plug your phone in for 5 minutes, just to give it say 10% more juice? I ask this because whenever I charge my devices I never unplug it from a charge until it's 100% charged, but my friend has no problem plugging in his devices for 5 minutes, 10 minutes, whatever it takes to get a bit more charge so he can use them right away.

Overall, when he DOES charge his battery to 100%, he almost always has a dead battery long before I do. This happens on all of his devices, including his iPod, camera, and his iPhone, whereas my battery in those devices always lasts much longer. Thoughts?
 
Here is what I want to know: is it better to charge your battery to 100% (regardless of where the charge was at - 10%, 50%, 80%), or is it ok to charge it to whatever level you want, and will that type of behavior have any long term effects on the health of the battery?

To be more specific: does it hurt the battery if you plug your phone in for 5 minutes, just to give it say 10% more juice? I ask this because whenever I charge my devices I never unplug it from a charge until it's 100% charged, but my friend has no problem plugging in his devices for 5 minutes, 10 minutes, whatever it takes to get a bit more charge so he can use them right away.

Overall, when he DOES charge his battery to 100%, he almost always has a dead battery long before I do. This happens on all of his devices, including his iPod, camera, and his iPhone, whereas my battery in those devices always lasts much longer. Thoughts?


Here's what Apple says:
For proper maintenance of a lithium-based battery, it’s important to keep the electrons in it moving occasionally. Be sure to go through at least one charge cycle per month (charging the battery to 100% and then completely running it down).

http://www.apple.com/batteries/iphone.html
 
A lithium-ion battery in use typically lasts between 2-3 years. The worst condition is keeping a fully charged battery at elevated temperatures, which is more a problem with running laptop batteries. If used on main power, the battery inside a laptop will only last for 12-18 months.

I usually run my main laptop through the mains with the battery in, do you think the battery will be prolonged if you took it out when attached to the mains?
 
I was at my local Apple store the other day waiting for a genius appointment and watched as the genius explained to the woman in front of me that she needed to drain her battery completely every time before she recharged it. Needless to say when he got to me I didn't take his advice too seriously which by the way was that I had too many applications on my phone. He said that unless the application came from a reliable company I couldn't trust it and should not download it.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.