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In recent years, the market for external battery packs has really exploded. With so many different battery packs available, it can be difficult to know which one suits your needs best. You should identify what you want the USB battery pack to accomplish. There is a wide variety of packs available, and they all do essentially the same thing. However, not all battery packs are built with the same capacities or useful extras.

The best external battery packs are the most versatile. They strike a balance between build quality, battery characteristics, price and other features. In our review of external battery packs, we looked at rather high-capacity packs that lend themselves well to many different situations. Generally, the higher the battery pack's capacity, the more versatile it is. However, as battery capacity increases, so too does its physical size. Larger battery packs are less portable. 

 You should check to see how many amps the USB ports on the mobile battery pack can handle. This determines how quickly any device that you plug into the battery will charge. It's common to see two USB ports, one rated at 1 amp and one rated at 2.1 amps. The 2.1-amp port is useful for charging tablets. Trying to charge a tablet at only 1 amp isn't a good idea. Tablet batteries are usually in the 10,000-mAh (milliampere hour) range. It can take a long time to charge that large of a battery at only 1 amp.

In addition to the USB ports, the external battery pack should have a maximum amperage rating. This is the most power that the battery pack can pass through all available USB ports. For example, if the device is only rated for a maximum of 2.5 amps and has two ports, then the 2.5 amps will be divided between the two ports. That means you'd only get 1 amp for the first port and 1.5 amps for the second one, even though the second one may be rated for 2.1 amps. In short, the mobile battery pack cannot make full use of its power.

Not all external battery packs can reach a full charge in the same amount of time. This is due to several factors. The battery's capacity is foremost among them. It only makes sense that a higher-capacity battery would take longer to charge than a low-capacity battery. Another important factor is how many amps the input port is rated for. The higher, the better. Think of it like a highway. A 2-amp input would give you two lanes, whereas a 3-amp input would give you three lanes. The 3-amp input can move energy more quickly.

You'll also need to make sure the USB port on the other end of the charging cable is capable of matching the external battery's input rating. If that USB port or the cable itself cannot handle 3 amps, then it doesn't matter if your external battery pack can. In regards to charging your USB battery pack, the higher the numbers, the better.

There are many things to consider when looking for an external battery pack, but the most important is to make sure you find one that suits your needs. The most versatile packs have a high capacity, yet remain portable. They are also well built, with high-amp USB ports and inputs. With just a little bit of research, you can find the external battery pack that is perfect for you.

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