手機總是很快沒電 送你一些省電妙招4

4. Don’t always choose Wi-Fi over cellular.

4.不要總是選擇Wi-Fi而非蜂窩網絡

Many people, and even smartphone vendors such as Apple, claim that using Wi-Fi for wireless data consumes less power than using a cellular signal, so you should use Wi-Fi whenever you can. However, the Wirecutter’s testing found this isn’t always the case.

很多人，甚至包括蘋果智能手機的零售商，都說使用Wi-Fi作爲無線連接會比使用蜂窩網絡信號省電，所以你應該儘可能使用Wi-Fi。不過，Wirecutter的測試發現這並不總是行得通。

In testing in a location where both Wi-Fi and cellular LTE signals were strong, an hour of browsing over Wi-Fi used roughly the same aMount of battery power as an hour using LTE on an iPhone. On a Motorola Android phone, LTE used only 2 to 3 percent more power than Wi-Fi.

在Wi-Fi信號和蜂窩網絡LTE信號同樣強的情況下，使用iPhone手機測試，使用Wi-Fi瀏覽網頁1小時所耗費的電能與使用LTE是一樣的。在使用安卓系統的摩托羅拉手機上，LTE只比Wi-Fi多耗費2%到3%的電能。

In other words, as long as you have a good signal, you probably won’t see a huge difference between Wi-Fi and cellular data, and it’s probably not worth the hassle of switching between the two.

換言之，只要信號良好，Wi-Fi和蜂窩移動數據沒什麼區別，不值得費力在二者之間切換。

5.使用Siri和Google聽你的指令

5. Let Siri and Google listen for your commands.

iPhone和安卓手機都有免手動操作功能，可以通過語音指令，同它們的虛擬助手說話。你可以對iPhone手機說“Hey Siri”或者說“O.K. Google”，然後說出你的指令。這雖然方便，但這個功能需要你的手機經常收聽這句特別的指令，也需要使用一些電能。

Both iPhones and Android phones include a hands-free feature for summoning their virtual assistants by speaking voice commands. You can just say “Hey Siri” to the iPhone or “O.K. Google” and then speak your request or command. While convenient, this feature requires your phone to constantly listen for that special phrase, which uses some power.

然而如果你的手機支持這種功能，那麼禁用它也省不了多少電。Wirecutter使用iPhone 6s Plus和Nexus 6P進行測試，發現在兩個小時時間內，開啓虛擬助手和禁用虛擬助手，所費電量相差無幾。

Yet if you have one of the phones that supports this feature, disabling it won’t conserve much battery life. In the Wirecutter’s testing with an iPhone 6s Plus and a Nexus 6P, there was a negligible difference in battery usage between having the always-on virtual assistant enabled or disabled over a two-hour period.

使用Siri 或O.K. Google會使用一些電能，所以，如果手機電池電量很低了，你可以暫時停止對手機一個接一個地發問。但是開啓這個功能本身沒什麼值得擔心的，而且這個功能確實很方便。

Using Siri or O.K. Google uses some energy, so if your phone’s battery is getting low, you should probably stop asking the phone question after question during your commute. But just having the feature enabled isn’t worth worrying about — and it can be quite convenient.

6. 不必放棄可靠廠家生產的第三方充電器

6. Don’t forgo third-party chargers made by reputable vendors.

網上有個常見的警告，是說你一定要使用和手機配套的原廠充電器，否則會對手機電池有所損害。事實上，手機本身帶有所有負責充電的線路。AC適配器（這是交流電源更準確的說法）只是把來自牆上插口的交流電轉化爲低伏特、低安培的直流電源，並通過USB接口充入手機。所以你也可以通過USB接口連接電腦、USB充電寶或車載電池給手機充電，手機的設計就是要允許各種電能來源都能爲它充電的。

A common warning around the Internet is that you should use only the charger that came with your phone, otherwise you could damage your phone’s battery. In reality, the phone itself contains all the circuitry responsible for charging its battery. The AC adapter (as it’s more accurately known) simply converts the AC current from a wall outlet into low-voltage, low-amperage DC current that it provides via a USB port. This is why you can also charge your phone using the USB port on a computer, a USB battery pack or a charger in your car — the phone is designed to allow it to charge from a variety of power sources that can produce a wide range of current.

最後，有人可能警告過你，便宜的第三方充電器會毀掉你的手機。這有部分是真的：很多充電器——特別是在網上出售的便宜樣機，甚至是本地購物中心小攤裏賣的充電器——做工很糟，或者使用質量低劣的元件。質量差的充電器不僅會弄壞你的手機，而且還會漏電，讓你受傷。所以如果要更換充電器，或多買一個備用，一定要選擇可靠的生產廠家。

Finally, you may see warnings that a cheap third-party charger could damage your phone. There’s some truth here: Many chargers — especially budget models sold online, or even at your local shopping mall kiosk — are poorly made, or use low-quality components. A poorly made charger can not only damage your phone, but could also hurt you by exposing you to dangerous currents. So if you’re replacing your phone’s AC adapter, or buying an extra, stick with a reputable vendor.