手機總是很快沒電 送你一些省電妙招3

Beware battery-saving myths.

當心那些關於節省電能的錯誤說法：

1. Closing unused apps.

1. 關閉不常使用的應用程序

There is plenty of inaccurate conventional wisdom about methods to prolong battery life. Let’s start with one of the worst “tips”: Closing (or force-quitting, as it’s commonly called) apps you are not currently using. The theory is that apps running in the background are using your phone’s components, so quitting them will save energy.

關於延長電池使用時間，有很多不準確的傳統觀點。就從最糟的這條“小貼士”開始吧：關閉（或者所謂“強制退出”）你不經常使用的應用。這個貼士的理由是，在後臺運行的應用使用了手機的元件，所以關閉它們可以省電。

While that may be true on a computer, smartphones are designed differently: Once an app is no longer in the foreground — meaning you are not actively using it — most or all of its processes are frozen. In other words, while an app may still be loaded in a phone’s memory, it probably is not doing much in the background to drain your battery.

這或許適用於電腦，但智能手機的設計原理是不同的：應用一旦不在前臺運行，也就是說你並沒有使用它的時候，它的全部或絕大部分運行是凍結的。換言之，這個應用或許還在手機的內存裏，但它在後臺卻不會使用電池電能。

Finally, quitting apps actually has drawbacks: When you force-quit an app, all of its code can be purged from your phone’s RAM, which means that the next time you open the app, the phone has to reload all of that code. That, of course, requires energy.

最後，退出應用其實是有害處的：強制退出應用的時候，它的代碼會從手機的RAM中清除，也就是說，下次你再運行這個應用的時候，電腦要重新加載所有代碼。這當然需要耗費電能。

2. Don’t assume turning off Wi-Fi will always help.

2.關閉Wi-Fi不總是有用

A common suggestion for extending battery life is to disable Wi-Fi. However, if you’re in range of a strong Wi-Fi signal, your phone uses less energy to connect to the Internet with a Wi-Fi connection than a cellular one. If you regularly use apps that rely on your location, having Wi-Fi enabled helps your phone determine its location without having to rely solely on power-hungry GPS features, so it actually helps a battery last longer.

一個關於省電的常見建議是關閉Wi-Fi。然而，如果你所在的地方Wi-Fi信號很強，相比蜂窩網絡連接，手機使用Wi-Fi就可以用很少的電量連上網絡。如果你經常使用和位置有關的應用，打開Wi-Fi就可以讓手機檢測到自己的位置，而不是僅僅依賴非常耗電的GPS功能，所以這對省電也有幫助。

An exception is when you’re at the edges of a Wi-Fi network, where your phone is struggling to get a good connection, and you have a good cellular data connection. But in most cases, you’re usually better off keeping Wi-Fi enabled.

不過，如果你正處於Wi-Fi網絡覆蓋的邊緣，手機努力想得到更好的連接，而且此時蜂窩網絡數據連接良好，這種情況下例外。但是在大多數情況下，最好還是讓Wi-Fi開着。

3. Avoid disabling all location services.

3.不要禁用所有位置服務

Many apps that use your location do so only intermittently. Even using the Maps app for short navigation sessions doesn’t use more than a few percent of your battery’s capacity — and having the phone’s screen continually on is a big part of why navigation uses a lot of power.

很多應用都只是間歇獲取你的位置。就算使用地圖應用做短期導航，也不會耗費很多電能——讓手機屏幕一直亮着纔是導航功能費電的原因。

In other words, don’t disable all of your phone’s location-based features just to extend your battery life. You won’t see a big jump in use time, but you may end up disabling — and subsequently missing — useful features. Instead, check (using the tips above) to see if any of apps consuming the most battery life also track your location. If so, and if you don’t need that location tracking, consider disabling it for those apps.

換言之，不必爲了省電禁用手機裏所有和位置有關的應用。這樣不會大量增加使用時間，但卻會讓你錯過很多有用的功能。你可以根據上文的提示，檢查哪些耗電最多的應用在使用定位功能。如果你不需要它的定位功能，就可以關掉。