解决iPhone耗电的终极指南

iamiii

http://www.overthought.org/blog/ ... g-ios-battery-drain

The Ultimate Guide to Solving iOS Battery Drain

解决iPhone耗电的终极指南

I worked on the Genius Bar for almost two years, and the most difficult issue to solve was short battery life. It was extremely difficult to pinpoint the exact reason why someone's battery was draining.

我在苹果的天才吧干了差不多两年，最棘手是解决某些iPhone耗电问题。

I made it my mission to discover the specific reasons for iOS battery drainage. This article is a product of my years of research and anecdotal evidence I gathered in the hundreds of Genius Bar appointments I took during my time as a Genius and iOS technician, as well as testing on my personal devices and the devices of my friends.

我决定挑战自己，找出这个问题的原因。这篇文章就是研究的成果。

iOS 7.1 came out recently and brought with it a bevy of design tweaks and performance enhancements. However, some users are reporting poor battery life since the update, and many blogs are reporting it as fact.

刚刚发布的iOS 7.1带来了很多特性，但很多用户都诉苦说，电池使用时间缩短了。

This is not one of those "Turn off every useful feature of iOS" posts that grinds my gears. My goal is to deliver practical steps to truly solve your iOS battery woes.

很多类似的文章会告诉你，“关掉某个特性XXX就不会耗电了”，这是因噎废食。我的目标是找出真正的原因。

One quick thing before we start — 99.9% of the time it is not actually iOS that is causing your battery to drain quickly. I guarantee you that if you erased your phone and there were no apps or email on it, it would last for ages. But, no one uses their device like that, nor should they. Hopefully with these steps you will be living in iOS battery bliss while still using all the apps and features you love.

长话短说，99%的情况下，耗电并不是iOS自身的责任。不妨做个测试，假如重置手机并不安装任何App不设置邮件账户，你会发现电池相当耐用。但是，什么都不安装是一种理想状态，实际上没人会真的这样用，事实上也不应该这样用iPhone。我以下的建议，将帮助在解决耗电问题的同时，还保留iPhone的强大功能。

But first, we need to test and see if you even have a problem to begin with.

首先，我们先看看你的iPhone是不是有耗电的问题。

How to Test Your iOS Battery Drain

如何测试你的iPhone是不是真的耗电

There is a quick and easy battery life test built into your device, if you do a little bit of math — the Usage and Standby times. Head on over to Settings > General > Usage and check out your times.

在iPhone上，你就可以直接看到电池的使用情况。打开设置，进入“常规”，再进入“用量”，就可以看到电池使用情况。

Your Usage time is how long you have actually used your device, and the Standby time is how long your device has been dormant in-between the times you've used it plus your Usage time. A better name for Standby time would be "Total Time since unplugged." The key to look for is that your Usage time should be significantly lower than your Standby time, unless you have been using your device every single second you've had it unplugged. If this is not the case and your Usage time is exactly equal to your Standby time, you have a severe problem. The bottom line is that your Usage time should be accurate to how much you've used it since you took it off the charger.

“使用时间”是指...“待机时间”是指...

So here's the test: write down your usage and standby time, press the sleep/wake button (or lock button, as some call it) to put the device to sleep, and set the device down for five minutes. When you come back, take note of the change in time. If your device is sleeping properly, then the Standby time should have increased by five minutes and your Usage time by <1 minute . If your Usage time rises by more than one minute, you have a drain problem. Something is keeping your device from sleeping properly, significantly shortening the time it will last.

好了，下面是测试办法：用笔记下当前的“使用时间”和“待机时间”，然后按一下电源键，让设备进入睡眠状态不要使用它，五分钟以后，打开手机，重新记下“使用时间”和“待机时间”。正常情况下，“使用时间”的增长应该小于一分钟。如果大于一分钟，说明你的设备有耗电问题：有什么东西在捣乱，不让你的手机进入休眠状态。换言之，你的手机需要看医生！

If you do not have a battery drain issue, then great! You don't even need the steps listed in this article. But if you or someone you know is constantly complaining about how short their battery lasts, read onward or send this post to them.

发现问题我们对症下药。如果没有耗电问题，我们也不能自己给自己乱吃药。

Here are the main causes of iOS battery drain I've found, and how to resolve them.

废话那么多，同学们，上课了，让我们翻开葵花宝典第一页。

Step 1: Disable Location and Background App Refresh for Facebook

第一步，关闭FaceBook的“位置服务”和“后台刷新”。

（国内没人装FaceBook，但是我们有新浪微博）

This first step may seem extremely specific, but that's because it is extremely common and extremely effective. It has also been well tested and confirmed on many devices.

把这个措施放在首位看起来有点奇怪，但它立竿见影。老军医亲测有效。

I just got the iPhone 5s about two weeks ago, and thought my battery was draining a little too quickly. Being the nerd that I am, I decided to run the app Instruments from Xcode, Apple's developer tool, in order to see what the problem was. Basically, Instruments acts as an Activity Monitor for your iPhone, allowing developers (or nerds like me) to see every process currently running and how much memory and processing power each app is using in real-time.

要问我是如何发现这个的，因为我是老军医。详细展开说，就是我给iPhone搭脉来着：使用XCode的Instruments工具，可以监测iPhone的心跳，查看是那个血管跳得最厉害。必须是注册老军医才能使用这个工具：也就是缴纳了99美刀的苹果教会员费才行的喔。亲。

During this testing, Facebook kept jumping up on the process list even though I wasn't using it. So I tried disabling Location Services and Background App Refresh for Facebook, and you'll never guess what happened: my battery percentage increased. It jumped from 12% to 17%. Crazy. I've never seen that happen before on an iPhone. The iPod touch exhibits this behavior, to my memory, although I haven't tested it in a while. For the iPhone, the battery percentage is usually pretty consistent.

总之，搭脉过程中，我抓到了FaceBook这个反革命，毙了以后，革命形势马上一片大好。

I have confirmed this behavior on multiple iPhones with the same result: percentage points actually increase after disabling these background functions of Facebook.

Bad, Facebook, bad.

打倒反革命！

Step 2: Disable Background App Refresh for Apps You Don't Care About

第二步：关掉那些用不上的“后台刷新”

My recent post explains the benefits of Background App Refresh. BAR is an awesome feature added in iOS 7, but you don't necessarily need it running for every app that supports it. Disable Background App Refresh for Facebook or other apps you don't absolutely need to stay up-to-date all the time.

根据苹果红头文件，“后台刷新”是个非常牛B的东西，又是多任务又是省电。说得比唱得还好听的事情，通常都不是真的。关掉“后台程序刷新”，只留几个你真的需要后台刷新的，这是你应该做的事情。

If there are apps you check regularly, and you trust the quality of the app and developer, then enable Background App Refresh with confidence and enjoy your apps being updated intelligently so they're ready for your enjoyment at a moment's notice. Background App Refresh is great if you need it, but you really don't need it for every single app on your iOS device.

如何分辨哪些App是需要开启“后台刷新”呢？简单而言，就是你经常会看看的那些App。一天才用一次的，坚决关掉。

Step 3: Stop Quitting Your Apps in Multitasking

第三步：不要手动退出你的App

iOS 7 made it super fun to close your apps: all you have to do is double-click the home button and swipe up on the app preview to blast it into a digital black hole.

iOS 7是个高富帅还会跳霹雳舞，最拿手的一招叫做“旱地拔葱”杀进程，炫酷得不行，人人都爱用。但其实，这个会导致系统更耗电。

What most people tell you is that closing your apps will save your battery life because it keeps the apps from running in the background.

大多数人会告诉你，不杀掉App，它们会一直后台运行把你的电量吃得精精光。杀进程，

Wrong.

错！

Yes, it does shut down the app, but what you don't know is that you are actually making your battery life worse if you do this on a regular basis. Let me tell you why.

By closing the app, you take the app out of the phone's RAM . While you think this may be what you want to do, it's not. When you open that same app again the next time you need it, your device has to load it back into memory all over again. All of that loading and unloading puts more stress on your device than just leaving it alone. Plus, iOS closes apps automatically as it needs more memory, so you're doing something your device is already doing for you. You are meant to be the user of your device, not the janitor.

杀掉App以后，下次你再用它的时候，又要再加载一次，这样反而费电。

The truth is, those apps in your multitasking menu are not running in the background at all: iOS freezes them where you last left the app so that it's ready to go if you go back. Unless you have enabled Background App Refresh, your apps are not allowed to run in the background unless they are playing music, using location services, recording audio, or the sneakiest of them all: checking for incoming VOIP calls , like Skype. All of these exceptions, besides the latter, will put an icon next to your battery icon to alert you it is running in the background.

Step 4: Disable Push Email Temporarily

第四步：（临时）取消邮件推送

If steps 1 through 3 did not solve your problem, try disabling Push email temporarily to see if it helps. Push email allows your device to receive instant notifications every time you get an email. It is great if you need to know when every single email comes in, but does impact battery if configured incorrectly.

如果前面三招都不管用，试试这个杀招：关闭邮件推送。邮件推送是个好东西，但是设置不正确的话，真气逆行，就会走火入魔。

I've seen many devices where Push is the primary cause of battery drain, but I've also seen plenty of devices have great battery life with Push enabled. It is really specific to your email and server settings. Try changing the setting to Fetch every hour, thirty minutes, or fifteen minutes and see if the drain stops. If that doesn't help, turn it back on. You could also trying disabling Push on individual accounts if you have multiple. Just keep referring to the test at the beginning of the article to see if that resolved your issue.

Unbelievably often, especially with Exchange push email, it's as if the phone gets stuck in a loop checking for email constantly. When this happens, the phone will usually die within six hours of being off the charger, and the Standby and Usage times in Settings > General > Usage will be exactly the same. These times are not the same because the "firmware is bad or corrupted", it's because push email is keeping the phone from sleeping properly.

Step 5: Disable Push Notifications for Apps That Annoy You

第五步：关掉那些用不上的“App通知”

Does that annoying game your child downloaded keep sending you push notifications to keep buying more digital sheep for the virtual farm? If so, every time you get one of those notifications, your phone wakes from sleep for a few seconds to light up your screen and wait for your potential action upon each notification.

Push notifications do not cause excess battery drain by default, so please don't hear me say you need to turn them all off. However, every message wakes your device for 5 to 10 seconds, so it can add up. If you receive 50 notifications during the day and never act on them, that will add 4 to 8 minutes to your Usage time, meaning you now have that much less time to do things you actually want to do on your device.

App通知并不是什么耗电的东西。但是，每条通知会唤醒你的手机5到10秒钟，积少成多，水滴石穿，精尽人亡。

Turn off those annoying Push notifications for apps you don't need notifications from. It might be a small difference, but it can add up.

Step 6: Turn Off Battery Percentage

第六步：关闭电量百分比显示

That's right, you heard me.

对的，你丫没有看错。

Turn off that battery percentage meter and stop worrying about your battery drain. You can find this setting in Settings > General > Usage, right above where your battery times are listed.

One thing I found in my Genius Bar experience is that people that are anxious about their iOS device battery life are constantly checking it to see the percentage and how much it has dropped from the last time they checked it. So if you check your device twice as much, simply to check on the battery life, you are essentially halving the time your device will last.

Stop freaking out and enjoy your life. There are more important things to worry about than your device's battery life. The control freak inside you might freak out the first few days you do this, but you'll get used to it.

电量百分比显示，会照成一些强迫症用户不停地看电量，结果耗电变得更快。

Step 7: Go to an Apple Retail Store

第七步：去苹果店寻求专业意见

Update: I was informed after posting this that the Apple battery test only runs on the iPhone 5 and up.

I know, you hate making a Genius Bar appointment because it's loud and crazy in there, but I have a good reason to add this to the list.

According to my sources, Apple has rolled out a new 'Extended Battery Life Test' for all iOS technicians that allows them to see a detailed report of battery usage on your device. It takes only a few minutes to run and, from what I've heard, is comprehensive. I have not had a chance to see this test for myself, but my friends tell me it rocks.

苹果店有工具可以监测到底是什么App在耗电，然后对症下药，药到病除。

The other rare possibility is that your physical battery is defective, and the technicians can replace it for free if your iOS device is under warranty, or very cheaply if it's not.

另一个可能原因是你的iPhone存在硬件问题，苹果店可以帮你换个新的。

Step 8: Enable Airplane Mode in Areas of Poor Cellular Service

第八步：信号不好的时候，启动飞行模式

One major reason your battery could be draining too quickly is poor cellular service. When the iPhone detects that you are in a place of low signal, it will increase the power to the antenna in order to stay connected enough to receive calls (primarily) and maintain a data connection.

风水不好会害死人。信号太差，手机也会精尽人亡。

This will destroy your battery life if you are constantly in a location with 1 bar or no service at all. The unfortunate thing is that this can happen in more places than you expect — any building with metal studs in the walls, aluminum buildings, buildings with dense concrete walls, heavily populated city areas, and downtown areas with with lots of tall buildings.



Often times you may get a strong signal on the top floor of a building, but simply moving to a lower floor, such as the basement, will immediately cause your iPhone to hang on to signal for dear life at the expense of your battery. Note that this severe drain will happen even if you have a strong Wi-Fi connection, because your phone still needs the cellular connection for calls and SMS messages (the green-colored texts in the Messages app).

If you are in an area with poor cell coverage, and you still need to receive calls, I've got bad news — there is really nothing you can do. But if your service is so poor that you can't receive calls anyway, I recommend turning on Airplane mode by swiping up from the bottom of your device to access Control Center and tapping the Airplane icon.

在手机信号太差的地方，反正你也很难接掉电话，不如直接开启飞行模式，还可以省电。

One thing you may not know about Airplane mode: you can actually turn Wi-fi back on after enabling Airplane mode. Just tap the Wi-Fi button in Control Center (the icon directly to the right of the Airplane). This is perfect for places, like an airplane, where you have zero cellular coverage but a strong Wi-Fi signal.

在飞行模式下，你依然可以开启WIFI来上网。

If you have Wi-Fi and want to be really fancy, you can disable just the cellular data portion of your signal, e.g. EDGE, 3G, 4G, or LTE. Most people don't know that your phone is actually receiving two signals simultaneously: one for calls and SMS, and one for data.

有WIFI的情况下，可以考虑禁用“移动数据”。电话照打，网照上，但费电的移动数据模块已经被关闭。

The signal strength meter on the iPhone only shows the signal strength for the non-data connection, which means theoretically your iPhone could show 2-3 bars (or dots on iOS7) for your 1x connection but in reality you could be getting 1 bar of LTE/4G/3G connection, causing the phone to go into heavy search mode. To disable just the Data connection of your iPhone, head over to Settings > Cellular Data and switch Cellular Data off. Again, doing this will allow you to receive phone calls (if you still have a signal) while maintaining a data connection through Wi-Fi.

Conclusion

结论：福祿上天賜善人 回春妙手真如神

I guarantee you that if you follow these steps, you will be getting the best battery life possible out of your iPhone, iPad, or iPod touch.

If your device is still not lasting you a full day, and you can't stomach heading into one of the stainless steel noise chambers I lovingly refer to as your nearest Apple Retail Store, don't worry. There is still hope for you.

The reason your device isn't lasting all day might simply be because you are a heavy user, and your iOS device is acting completely normal under the grueling pace with which you use it. That is not a fault of the device, or you, for that matter. You are simply pushing it beyond it's capabilities. My advice for you is to buy a car charger, a second charger for travel/work, or a battery case to extend your battery life .

I hope this article empowers you to stop stressing about your battery life, and frees you up to enjoy the great device in your hands. There are more important things in life that deserve our attention, so the more we minimize the trivial stressors, like bad battery life, the more time we can spend on people and problems that really matter.

junenc

楼主辛苦

smiledog

是很辛苦，如果可以把英文和中文分隔开的话，读者也就不辛苦了。。

5.5

楼主翻译的太喜剧了

商务车

老军医是什么？

手机也会精尽人亡？