我们在7 个教程(7 Tutorials)中回顾了各种设备，但从来没有便携式USB 充电器(USB charger)。我最近不得不从欧洲(Europe)去美国旅行(United) ，(States)我知道我需要一个随身携带。微软(Microsoft)很乐意为这次旅行分享他们的诺基亚通用便携式 USB 充电器(Nokia Universal Portable USB Charger)，以便我可以使用它并与我的诺基亚 Lumia 930(Nokia Lumia 930)一起测试它。从这篇评论中了解它的效果：
硬件规格和包装
正如您对如此简单的设备所期望的那样，诺基亚通用便携式 USB 充电器(Nokia Universal Portable USB Charger)( DC-18 ) 的包装非常简单：它采用可回收的透明盒子(transparent box)，让您可以轻松看到设备。
在包装盒内，您会找到充电器、微型 USB 数据线、保修和小型印刷指南。
充电器非常小巧便携：高度和宽度(height and width)仅为 57 毫米（2.24 英寸），厚度为 14.9 毫米（0.58 英寸），重量仅为 65 克（2.29 盎司）。它有一个平均容量为 1720 mAh 的锂离子电池，充电时间(charging time)为 4 小时（240 分钟）。
您可以在此处阅读其完整规格：诺基亚通用便携式 USB 充电器 - 详细规格(Nokia Universal Portable USB Charger - Detailed specification)。
设计(Design)，建造质量(Build Quality)和用户体验(User Experience)
诺基亚通用便携式 USB 充电器(Nokia Universal Portable USB Charger)是一款小巧美观的设备，有四种颜色可供选择：白色、蓝色、黄色和红色。我们收到了白色版本进行测试。
由于其体积小且呈方形，您可以轻松随身携带。它可以装进你的口袋，和你的智能手机一起。在我的测试中，我将它与诺基亚 Lumia 930(Nokia Lumia 930)一起使用，即使在智能手机连接到它并充电时，我也可以将它们放在牛仔裤的前口袋中。
如果仔细分析的话，诺基亚通用便携式 USB 充电器(Nokia Universal Portable USB Charger)的设计相当巧妙。首先(First)，它有一个嵌入式电源线，用作开(On)和关(Off)按钮。仅当您插入内部的电源线时，设备才会尝试为您的智能手机充电。这可以防止带有触摸按钮的充电器发生意外放电。此外，当您插入电源线时，电池电量指示器(battery level indicator)会显示可用电量。在户外使用充电器时，电平指示器也非常明显，这很棒。
您的智能手机会相对较快地充电，但为了尽可能获得最佳充电效果，建议您不要在连接到充电器时使用智能手机。我还测试了当我使用Lumia 930进行拍照、Facebook和GPS 导航(GPS navigation)等事情时连接到充电时的场景。在这些情况下，诺基亚通用便携式 USB 充电器(Nokia Universal Portable USB Charger)只能帮助我的智能手机保持相同的电池电量，直到充电器完全放电。
该充电器的唯一缺点是容量降低和充电时间(charging time)缓慢。诺基亚通用便携式 USB 充电器(Nokia Universal Portable USB Charger)的容量仅为 1720 mAh，而大多数智能手机的电池容量超过 2000mAh。例如，新的诺基亚 Lumia 735(Nokia Lumia 735)的电池容量为 2220 mAh(mAh battery)，而我的Lumia 930的电池容量为 2420 mAh(mAh battery)。因此，您在旅途中永远无法为您的智能手机充满电。该充电器仅适用于智能手机电池无法满负荷处理的一日游。如果您进行更长的旅行并且不能为智能手机充电超过一天，那么您应该寻找更强大的充电器电池容量(battery capacity)。
第二个问题是充电需要四个小时。这相当慢，特别是如果您考虑到其电池的平均容量。如果它可以在大约两个小时内自行充电，那就太好了。
判决
我们对诺基亚通用便携式 USB 充电器(Nokia Universal Portable USB Charger)的工作方式感到满意。这是一款非常便携的充电器，您可以随身携带，放在任何口袋里。它与许多智能手机兼容，并且可以快速充电。它的容量相当平均，无法为大多数智能手机提供完整的电池电量。(battery charge)它最适用于需要提升智能手机电池电量的快速旅行，以便在您回家之前持续使用。如果您需要更多电池容量(battery capacity)的长途旅行，您应该寻找其他地方。
Reviewing The Nokia Universal Portable USB Charger
We have reviewed all kinds of deviсes here аt 7 Tutorials, but never a portable USB charger. I recently had to go on a trip from Europe to the United States and I knew I would need one with me. Microsoft was kind enough to share their Nokia Universal Portable USB Charger for this trip so that I could use it and test it together with my Nokia Lumia 930. Learn how well it worked from this review:
Hardware Specifications & Packaging
As you would expect from a device this simple, the packaging for the Nokia Universal Portable USB Charger (DC-18) is very straightforward: it comes in a recyclable transparent box which allows you to easily see the device.
Inside the box you will find the charger, a micro-USB cable, the warranty and a small printed guide.
The charger is very small and portable: it is only 57 mm (2.24 inches) in height and width, it is 14.9 mm (0.58 inches) thick and it weighs only 65 grams (2.29 ounces). It has a Li-Ion battery with a an average capacity - 1720 mAh and its charging time is of 4 hours (240 minutes).
You can read its complete specifications here: Nokia Universal Portable USB Charger - Detailed specification.
Design, Build Quality & The User Experience
The Nokia Universal Portable USB Charger is a small and good looking device that's available in four colors: white, blue, yellow and red. We received the white version for testing.
Due to its small size and square shape, you can easily carry it with you. It fits into your pockets, together with your smartphone. In my testing I have used it together with a Nokia Lumia 930 and I had no issues carrying them both in the front pockets of my jeans, even while the smartphone was connected to it and charging.
The design of the Nokia Universal Portable USB Charger is quite smart, if you analyze it carefully. First, it has an embedded cord that functions as an On and Off button. The device tries to charge your smartphone only if you plug the cord found inside. This prevents accidental discharges that happen with chargers that have touch-based buttons. Also, when you plug the cord, the battery level indicator displays the charge that is available. The level indicator is very visible also when using the charger outdoors, which is great.
Your smartphone will get charged relatively quickly but, in order to get the best charge possible, it is recommended that you do not use your smartphone while connected to the charger. I also tested the scenario when I was using my Lumia 930 for things like taking pictures, Facebook, GPS navigation while connected to the charge. In these scenarios, the Nokia Universal Portable USB Charger only helped maintain the same battery levels on my smartphone, until the charger got discharged completely.
The only drawbacks of this charger are its reduced capacity and its slow charging time. The Nokia Universal Portable USB Charger has a capacity of only 1720 mAh and most smartphones have batteries of more than 2000mAh. For example, the new Nokia Lumia 735 has a 2220 mAh battery while my Lumia 930 has a 2420 mAh battery. As a result, you will never get a full charge of your smartphone while on the go. This charger is useful only for one day trips that your smartphone's battery can't handle with a full load. If you go on a lengthier trip and you can't charge your smartphone for more than a day, then you should look for beefier chargers with a more generous battery capacity.
The second problem is the fact that it takes four hours to charge. This is rather slow, especially if you take into consideration the average capacity of its battery. It would have been great if it could have charged itself in about two hours.
Verdict
We were pleased with the way the Nokia Universal Portable USB Charger worked. It is a very mobile charger that you can take anywhere, in any of your pockets. It is compatible with many smartphones and it quickly charges them. Its capacity is rather average and it won't be able to deliver a full battery charge for most smartphones. It is best used for quick trips where you need a boost to your smartphone's battery so that it lasts you until you get home. If you go on many lengthy trips where you need more battery capacity, you should look elsewhere.
