7. 偶尔校准电池就够了

7. Calibrate only occasionally.

多年来，使用充电电池的设备都需要“调整”或“校准”，这个步骤可以防止电池忘记自己实际上有多大充电电量。如今的智能手机电池已经没有这个问题了。

For many years, devices that used rechargeable batteries required “conditioning” or “calibrating,” a procedure that prevented the battery from forgetting how much capacity it actually had. Today’s smartphone batteries no longer suffer from this issue.

然而有可能发生的问题是，手机会不去追踪电池的充电量：随着使用与充电，所有电池都会渐渐损失充电量，手机软件并不总能计算出这种充电量的变化。每隔几个月给手机充满电，一直使用到电池耗尽，你的手机软件就可以检测出电池当前的充电量，让手机更好地估计手机还剩多少使用时间。换言之。电池的寿命不是永久的，但是手机的电池测量系统是可以更准确的。如果你发现你的手机显示还有80%电量，但是一会儿就用完了，你可能需要尝试这个步骤。

What can happen, however, is that the phone itself loses track of how much capacity its battery has: Every battery gradually loses capacity over time as you use and recharge it, and the phone’s software isn’t always good at accounting for this capacity change. By periodically (once every couple of months) fully charging the phone and then using it until it dies, your phone’s software will determine the battery’s current capacity and thus let the phone better estimate how long it will last on a charge. In other words, the battery won’t last any longer, but the phone’s battery meter will be more accurate. If you find that your phone claims you have 80 percent of a charge left, but it dies a few hours later, you should try this procedure.

如果这些都没用……

If all else fails …

如果上面这些办法你都试过了，每天的电量还是不够，那就多买一块电池吧。你可以买内置式电池，也可以买充电宝，这样一天到了最后电池还能多用几个小时，甚至还能把电池充满呢。

If you have tried all the above and still struggle to get through the day with your battery, consider buying an external battery. These accessories — which can take the form of a bulky case with a built-in battery that you wear on the phone, or a separate battery pack that connects to your phone with a cable — can provide power to last an additional few hours at the end of the day, or even to fully charge your phone’s battery.

Wirecutter测试了100多种充电宝，为手机充电几十小时，选出了几个最佳品牌。iPhone 6和6s的最佳充电宝是Anker的超薄手机充电外壳，它可以给完全没电的iPhone手机充满电，也就是说把电池的使用时间延长了一倍。对于比较大的iPhone手机――6 Plus和6s Plus――Wirecutter推荐Tylt的分离式充电手机壳(Energi Sliding Power Case)，因为这种手机壳是分体设计的，样子很好看。

The Wirecutter tested more than 100 external batteries for dozens of hours to pick a few favorites. Its favorite battery case for the iPhone 6 and 6s is Anker’s Ultra Slim Extended Battery Case, which has enough power to fully charge a dead iPhone and then some, more than doubling the phone’s battery life. For larger iPhones — the 6 Plus and 6s Plus — the Wirecutter prefers Tylt’s Energi Sliding Power Case because the case’s two-piece design makes it appealing.

至于安卓手机，充电宝是最佳选择。带有小型USB线缆的AmazonBasics Portable Power Bank充电宝提供2000毫安电量，是Wirecutter测试的最佳充电宝，可以和手机一起放入口袋，价格还不到10美元。最适合iPhone的充电宝是29美元的TravelCard，它几乎可以放进钱包里，带有内置式Lightning接口线缆，可以给手机充电。

For Android phones, an external battery pack is a good option. The AmazonBasics Portable Power Bank with Micro USB Cable 2,000 mAh is the best pack the Wirecutter tested that will fit in your pocket with your phone, and it’s less than $10. A great battery pack for the iPhone is the $29 TravelCard, which is almost thin enough to fit in a wallet — with a built-in Lightning-connector cable to charge your phone.

如果要用好几天，如果你需要重复给手机充电，或者有一个大的平板电脑和一个手机出差，Wirecutter推荐Anker PowerCore 15600。它能存储足够电量，为一部普通智能手机充电5次，为iPad Air之类大型平板充电两次，价钱低于40美元。

For days of smartphone power, the Anker PowerCore 15600 is the Wirecutter’s pick if you need to charge a phone repeatedly or keep a full-size tablet and phone topped up through a busy week. It has enough available power to charge a typical smartphone five times or to fill a large tablet such as an iPad Air almost twice — for under $40.

在迪斯尼乐园度过了焦虑的一天之后，特米纳买了一个Amazon充电宝。她说，这个充电宝可以给她的手机充电六次，但是太大了，所以并不理想。最后，她还是希望她的iPhone手机能有个好点儿的电池。

After her stressful day at Disneyland, Ms. Temeña bought an external Amazon battery pack. She said the pack could fully charge her phone six times, but it wasn’t ideal because of its bulk. Ultimately, she wishes her iPhone had a better battery.

“我不明白，现在手机都那么先进了，电池为什么就是跟不上呢，”她说。

“I don’t understand why a battery wouldn’t be able to keep up with all the other advances they’re putting into phones now,” she said.