Why does the iPhone take so long to start after a flat battery?
No modern device ever allows a Li-ion battery to completely die. Not even Apple. When you do that, bad things happen.. the battery essentially starts devouring itself.However, that’s not the issue here. When you’re getting low enough on a battery, the power management circuitry in your iPhone, always monitoring power, will shut down to prevent your totally killing the battery. Different phone manufacturers have different cutoff points, but it’s usually between 2.0V and 3.0V.When you plug your phone into a power dongle, that power will activate the power managment circuity in your phone, which includes the actual charger (nope, that thing you plug into the wall isn’t the actual charger) and the protection circuity.If the battery voltage is below around 3.0V, the charging circuity has to run a very low current trickle charge cycle until the battery voltage exceeds 3.0V. Again, every phone company has their own specific battery charging rules here, which factor in different formulations of the battery, etc. But given this low charging level, the phone can’t be turned on.Even after that, most phone manufacturers like a bit of margin before they’re going to allow the phone to turn back on. Depending on the power supply, it’s quite possible for a phone to draw more power than a charging circut can supply, particularly if you’re connected to a computer or modest-current power dongle. And there’s a big rush of power necessary to boot up the OS… no sense in allowing the phone back on at a battery level that would do little more than drain that battery.It’s also dealing with the nature of the battery charging cycle. One you’re past that initial trickle charge, the battery charges at full permitted current for most of the charging cycle. But battery voltage grows as the charge progresses, implying that a lower power batter discharges faster (Dave Haynie's answer to Is a battery discharging faster when it’s close to running out of juice or when it’s almost full?). So assuming the capacity scale for charging isn’t corrected for this, your first 5% into the battery will last significantly less time than your last 5%.So it makes sense to build up some reasonable, safe charge level in the battery before allowing the phone back on to draw it all back down again.
Why does my phone battery decrease even when it's turned off?
If it is happening in every time drastically and consistentlythen you should change your phone battery.Yes it is in detrimental state.Tips to prevent your battery:(If detriment in initial state)Dont try to charge by turning off the phone.Dont try to charge by keeping in airplane mode.Dont use other charger, use only the manufacture provided one.Don’t charge from 1% to 100%, if you do every-time. believe me no one can save your battery life span.for more details read this article: How to charge your phone in a good way
What would make the iPhone 6 shut down at 5% battery life?
Short version:This is by design and is the normal behavior of the iPhone (and many Apple products that use battery power), but Apple is nice enough not to force it on you in most cases. It protects your data, your battery life, and your life.But if you insist on draining it all the way every time - just know you're playing with fire - both figuratively and literally. (Read on for the deets)Long Version:Almost all Apple products that rely on battery power have this feature. An Apple laptop will start to warn you at about 20% battery and will prepare to sleep around 5%. If you're not actively using the laptop at the time - and I mean actively; a short break is more than enough to trigger the hibernation process - it will turn itself off after saving memory to disk.For the laptops - that's actually important. Once you're below 5%, there's a distinct possibility that you could drop to 0% before you have a chance to plug it in, and in that case, the laptop will shut down and you'll lose anything not saved.Worse - if the computer is in the middle of saving memory to disk when the power goes completely out, it could leave your hard drive in an inconsistent state - data loss, inability to start up... a host of troubles.Phones are slightly different. They don't have as much battery power (nor do they need as much as a laptop), but they can't really go to sleep the way laptops do. If they're on, they need to be listening for a cell signal. Phones have low-power modes in which many of the usual bells and whistles are suspended, but they'll still draw energy from the battery at a predictable rate. And they still need to be able to clean up and shut down properly.In almost all cases, iPhones are designed to turn off at 5% if not in active use (a call, for example). There's another very good reason the phone tries to shut itself down at 5%, according to Gizmodo:... when lithium-ion batteries get too low—like, literally zero percent—they get seriously unstable, and dangerous to charge. To prevent explosion-type disasters when you go to charge one that's been sitting around for a month or two, lithium-ion batteries have built-in self-destruct circuits that will disable (read: destroy) the battery for good, if it reaches rock bottom. - How To Take Care of Your Smartphone Battery the Right WayNow, you don't really want to carry around a little iBomb 6+, do you?
Why does the iPhone shut down before it reaches 0%?
This may be an issue of your iPhone not telling you the correct battery percentage, rather than your iPhone dying at 8%. A quick solution is calibrating your battery. Use your phone as usual, letting it die out on its own. Once dead, charge to 100%. Let your iPhone do its job, don't unplug until it reaches 100%. Place finger on home button - don't press yet. Place finger on power button - don't press yet. Now, with both fingers on the buttons aforementioned, press and hold both at the same time until your phone resets and reveals the Apple symbol. Calibrated!
Why does my iPhone 5 randomly shut off?
Whether it's an iPhone 5 or iPhone 6, and iPad Air or iPad mini, if your device keeps turning off at random, when the battery isn't even depleted, there's a lot you can try on your own before contacting Apple for help. Sure, sometimes it's a hardware problem with the battery or electronics, but often enough it's a software issue that a few simple steps can fix. If so, follow along and we'll get you back up and functioning smoothly in no time!1. Hard resetIf your iPhone or iPad won't charge, one of the first and easiest things to try is a hard reset. Whether it's really shutting down on its own, or it's rapidly depleting the battery due to rogue processes or Wi-Fi or cellular radio activity, a reset can help. Make all the "reboot Windows" jokes you want but sometimes bad bits get stuck and need to be flushed out.Press and hold down both the Sleep/Wake button and the Home button at the same time.Keep them held down until you see an Apple logo.Let go.Once your iPhone or iPad has rebooted, wait and see. If it stays on and operational, you're good. If not, or if it won't reboot, go on to the next step.2. Plug inIf your iPhone or iPad is rapidly discharging, once you plug in you should see it begin to charge and be able to read the battery level. No charge left means something drained your battery. Partial or full charge means you may have another problem.So, grab your Lightning or 30-pin Dock connector, plug into an outlet or USB port, and start charging. Once your topped up, keep an eye on your iPhone or iPad and see if it shuts down again. If not, great. If so, keep reading.3. Restore your iPhoneRestore through iTunesAfter trying the easy fixes, it's time to try the harder ones. In this case, restoring your iPhone or iPad in iTunes. iTunes is a safer bet than iCloud because it actually offloads, re-installs, and reloads your data rather than doing everything in-place and on your device. That can sometimes shake loose bad bits that even a hard reset or iCloud restore can't.Connect your iPhone, iPod touch, or iPad to iTunes on your Mac or Windows PC via Lightning or 30-pin Dock connector.Click on the Device tab at the top left.Click on Backup.Wait for the backup to finish.Click on RestoreWait for the restore to finish.When you're all done, see if your iPhone or iPad stays on. If so, hallelujah. If not, there's on more thing to try.
Will the sudden shutdown issue of iPhone 5 fix by replacing the battery?
If you have an iPhone 5 with the original battery , it is over 5 years old now . You should have the battery replaced if you continue to want the phone to deliver good performance . Batteries degrade over time and charging cycles , android , apple , windows phones and laptops all suffer this issue of degrading batteries . Smartphones like the apple iPhone should have a battery replacement sometime in their lifetime , usually after 2.5 years is a good preventative measure . They can go longer , I still have a iPhone 4 and 3G with their original batteries but here we are talking about the age and type of cpu spikes being different then later , newer models . As newer models have increasingly more power every year in their CPUs the batteries take more hits for power in computations . The 5 is no longer being supported with iOS updates now as it is considered obsolete from updates . They are still good phones but more limited now , if you accept the limitations and like the phone then have a battery replacement to keep it running in top shape . A update might be appealing to you for a SE model as they are now very reasonable in some places for their price .
Why does the battery of a phone drain when kept switched off?
Hi, thanks for A2A.My written answer for the related question:Battery department is very complex if you think of smartphones. At first, rechargeable battery technology is slowly emerged. But there are lot of problems regarding stability, ageing, memory effect, leakage problems. Slowly those problems were rectified and the latest Li based batteries has been invented. Now this battery occupies all smartphones in powering. These batteries too have leakage nature. But the amount of leakage is quite low when compared with other rechargeable batteries. At first when phone is charged to 100% and then it kept idle, it will lose 4 to 5% within 24 hours. At it will lose 5% of charge per month if the phone is switched off. So, theoretically when you start to keep a phone in idle stage at 50%, after 6 month your phone will be at 20% of charge. But, the problem is self discharge is not constant and it will vary according to the environment it is kept. The temperature of the environment is mostly the affecting factor of the battery. So. keeping your phone under ambient conditions, will help to reduce the self discharge rate. Mostly, the chances will be a favour for you!Hope it helps!