iPhone 4s Battery Life?

Phoal wrote:

LOL: found this on Apple site:

Use iPhone Regularly

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).

After reading some posts, I don't think that will be a problem, seeing a lot have of people have to recharge once a day :-/

How on earth can you make your battery last fo one whole month ??

I very rarely do this because it takes several days to run the battery down like that. It might be well to read up on lithium polymer batteries to see just what the terminology means. THis is a good reference source.

http://batteryuniversity.com/learn/article/is_lithium_ion_the_ideal_battery

@Phoal - Based on your comment of "I don't think that will be a problem, seeing a lot have of people have to recharge once a day :-/ How on earth can you make your battery last fo one whole month ??

I am thinking that perhaps you misunderstand the concept of: "Be sure to go through at least one charge cycle per month". One charge cycle means going all the way down to 0%, in other words totally draining the phone battery & then charging it up to 100%

I confess this probably isn't the best explanation, as I am no expert; but from research I have done, I understand this has to do with the battery maintaining a memory of its full capacity/size. If it is charged from 60% to 100% every day then at some point the battery thinks that it is only capable of this. When you then go to zero, well, it only wants to give you that 40% charge.

Double click and when the multi yask bar comes up hold and delete the apps runing so the battery will last longer

Double click on what ?

Double click on the "Home" button, the little round button toward the bottom of the phone.

I'm getting about 2 - 3 days out of mine, although I'm a bit atypical, I guess.

• No 3G (Edge is good enough, near me)
• Minimal WiFi
• Virtually no location services or bluetooth.
• Some notifications.
• Three e-mail accounts, but push is switched off.
• Occasional photos.
• About two hours of listening to music each day.
• I use Twitter and Chess.com's app fairly often as well as doing an average amount of texting. Very few actually calls.

Obviously, the more circuitry you switch on, the quicker the battery goes down. My 4s has run from a restore of my old iPhone 4, so I've never done a fresh start.

M.

The home button

Bananas4Apples wrote:

@Phoal - Based on your comment of "I don't think that will be a problem, seeing a lot have of people have to recharge once a day :-/ How on earth can you make your battery last fo one whole month ??

I am thinking that perhaps you misunderstand the concept of: "Be sure to go through at least one charge cycle per month". One charge cycle means going all the way down to 0%, in other words totally draining the phone battery & then charging it up to 100%

I confess this probably isn't the best explanation, as I am no expert; but from research I have done, I understand this has to do with the battery maintaining a memory of its full capacity/size. If it is charged from 60% to 100% every day then at some point the battery thinks that it is only capable of this. When you then go to zero, well, it only wants to give you that 40% charge.

First, there is NO MEMORY problem with Lithium Ion batteries. A charge cycle can be 10 10% charges, or one 100% charge, or any combination of percentages that add to 100. The reason for running the battery down until the phone shuts off is to recalibrate the chip that reports the percentage of charge. Lithium Ion batteries deteriorate with age, and an accurate representation of the present charge level is based on the last full recharge cycle.

Hmmm , I don't think they mean that on the apple site:

"Be sure to go through at least one charge cycle per month (charging the battery to 100% and then completely running it down)."

So i think one cylce is to 100% and then to 0%.

Phoal wrote:

Hmmm , I don't think they mean that on the apple site:

"Be sure to go through at least one charge cycle per month (charging the battery to 100% and then completely running it down)."

So i think one cylce is to 100% and then to 0%.

From Apple's website, in reference to the batteries in the iPad 2 (same type in later iPhone and iPad).

For proper reporting of the battery’s state of charge, be sure to go through at least one charge cycle per month (charging the battery to 100% and then completely running it down).

This is ONLY to keep the battery meter calibrated to the inevitable deterioration of the battery as it ages. It is NOT required for the battery power, ONLY for the chip that monitors charge level.

There is much confusion, and misunderstanding regarding the Lithium Polymer Ion batteries. They do NOT suffer from 'memory' effects. You can charge them 10 times a day, and then go a day or two between charges. It will not harm the battery, or reduce its ability to deliver power to the phone.

I have problems with my iPhone screen
The angle approximately 160 degrees when I look at the screen , the gray color change to blue and invert gray colors to blue

only bottom-right in 160 degree or more view

Alirohani wrote:

I have problems with my iPhone screen
The angle approximately 160 degrees when I look at the screen , the gray color change to blue and invert gray colors to blue

only bottom-right in 160 degree or more view

Wrong group, but at 160 degrees, LCD screens don't have good color.

thank u

where is this groupe?

rphunte42 wrote:

First, there is NO MEMORY problem with Lithium Ion batteries. A charge cycle can be 10 10% charges, or one 100% charge, or any combination of percentages that add to 100. The reason for running the battery down until the phone shuts off is to recalibrate the chip that reports the percentage of charge. Lithium Ion batteries deteriorate with age, and an accurate representation of the present charge level is based on the last full recharge cycle.

Running down the battery until the phone shuts off will not recalibrate the chip or battery. It will crash your phone. It may also terminate rogue processes that cause extra battery consumption but I don't recommend doing that. The only time Apple talks about recalibrating batteries is for devices with removable batteries such as the MacBooks.

I fixed a rapid iPhone 4s battery drain several days ago. I simply changed the MMS APN. Details follow.

My wife's phone recently started draining its battery fast -- 100% in well under 24 hours with no usage. The phone had been fine then started doing this for no known reason. We did the usual reboots, turning off unneeded stuff, the time zone fix, etc. That didn't work but with the above change it's now back to normal and can go for days on standby.

I have an identical phone without the problem so I compared the two using XCode's Instruments. CommCenter on her phone would spike the CPU briefly every several seconds and the log showed a message '... is telling PDP context -1 to go active' every 30 seconds. I suspected these were related.

From my understanding, there's no such thing as a context -1 and this must be a bug. Launch field test (by dialing *3001#12345#*) and it'll show you the PDP contexts, which are numbered 0, 1, 2, etc. I don't know how long context -1 had been around but I'm guessing the whole time the battery was draining fast. We had tried rebooting the phone to fix the battery drain but that didn't work. I don't know if the phone was keeping the context around across reboots, but I doubt it. I suspect the GPRS network was keeping it and pushing it to the phone. I know next to nothing about GPRS, though, so that may be wrong/impossible.

I searched using google for a way to force all contexts to be flushed. What I found was that changing the APN would do that. As it happens, her MMS APN (Settings > General > Network > Cellular Data Network) wasn't set, preventing her from sending multimedia attachments in texts. I set it correctly. (Had it been it set correctly I would've cleared it then set it back.) That seems to have fixed the battery drain, plus she can again send images in texts now.

Now three caveats. First, I can't reproduce the battery drain so I can't verify that these steps always work. But I can say that the fast draining had been going on for a few weeks and it stopped immediately following the above.

Second, shortly after doing the above the springboard became unresponsive to touches. I don't know what that was all about -- I've never seen it before (and I have changed the APN before). I had to reboot the phone to recover. (Interestingly, pressing and holding the home and sleep/wake buttons didn't bring up the power off slider; the phone just shut off after a few seconds.) Now we had tried rebooting the phone to fix the battery drain before and it didn't work and it didn't become unresponsive for a while after changing the APN, long enough to see the battery drain problem looked like it was fixed, but I can't be sure the reboot wasn't important somehow.

Third, your phone may not be having the same problem. But it's easy enough to check the log for the 'PDP context -1' message using XCode or, say, YASC (in the AppStore). However, that presumes the battery drain is related to that message and not some other unrelated problem that causes CommCenter to wake up every several seconds.

Since the potential fix is so easy, it's worth just trying it. Go to Settings > General > Network > Cellular Data Network, write down the MMS APN, clear it, then reboot. Go back to the same page and put the MMS APN back and reboot again. (The reboots may not be necessary.) See if the drain is fixed.