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USB Power Delivery is the fastest way to charge iPhone and Android devices

With the current generation of smartphones and their much faster processors and vivid, high-resolution displays, and always-on connectivity, demands on battery performance are now higher than ever.

You may have noticed that, while you are on the road, you're quickly running out of juice. If you have this problem, portable batteries and PD fast charger than what may have come in the box with your device may be the solution.

But not all portable batteries are the same, even though they might use similar Lithium Polymer (LiPo) and Lithium-Ion (Lion) cells for capacity and look very much alike. Plus, modern smartphone hardware from Apple and various Android manufacturers support faster-charging rates than what was previously supported.

If you use the charger that comes in the box of the current-generation iPhone hardware, or if you buy just any portable battery pack on the market, you're going to be disappointed. Ideally, you want to match your charger, battery, and even the charging cable to the optimal charging speeds that your device supports.

There are three different high-speed USB charging standards currently on the market. While all will work with your device using a standard legacy charge mode, you will want to match up the right technology to optimize the speed in which you can top off your phone, tablet, or even your laptop. Let's start by explaining the differences between them.