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When you are considering which Power Bank is best for you, there are number of things you need to know. Click For More About This Power Bank Product contains additional resources about why to recognize this view. Such as 1. Capacity vs. Portability The primary criteria to contemplate when getting a external battery pack is capacity, which is measured in milliampere-hour mAh. The capacity of your devices battery is also measured in mAh, so loosely speaking, if your telephone has a 2000mAh battery, a 2000mAh battery pack is capable to recharge it totally once. Even so, simply because of energy lost due to voltage conversion and circuit resistance this is hardly ever the case in reality. The term "real capacity" refers to the actual power output of a energy bank after some power is lost as heat during the energy transfer process. This is accurate of all power bank. While you can get power banks with a higher capacity so that it is capable to recharge a device numerous occasions over, keep in mind that this generally also indicates that it is larger, heavier, and pricier. 2. The Battery Packs Input Current It is straightforward to persuade oneself to purchase a large-capacity battery pack. But one tends to overlook that the larger the capacity, the longer it requires to recharge. In reality, most people we know who have 15,000mAh battery packs leave them to charge overnight. One more issue that impacts how extended it takes to top up the charge is the battery packs input current. Most battery packs accept between .8 amps and 1.5 amps, with the greater currents typically found on the greater capacity ones. If you come across two seemingly identically-speced battery packs and both cost the same, this small detail could be the tiebreaker. Some battery packs enable themselves to be charged although theyre charging other devices. Even so, we do not suggest it since continuous pass-through charging may possibly affect the batterys lifespan. 3. Your Cell Phone Input Current Most smartphone-oriented battery packs output at most 1A at 5V through the USB port. Even though this functions fine for most people, some may notice that their smartphone now requires a longer time to recharge as compared to when a wall charger is used. This is especially correct if the phonecell phone is able to accept a greater current. Most tablets require at least 1 amp to charge too, with some drawing up to 2 amps. Take the Apple iPad Air for instance, which comes with a 12W USB wall adapter that supplies 2 amps. If you were to plug the iPad Air to a battery packs 1 amp USB port, itll either not charge or charge super slowly. So if you are looking to charge a tablet, our advice is to get a battery pack that is capable of outputting higher than 1 amp at least 1.5A if you have an Android tablet, and 2 amp if youve an iPad. Lastly, theres no harm using a larger-powered port on a smartphone, as the device only draws what is necessary. In reality, it might even charge more quickly if its able to draw more power. 4. High quality vs. Price As the adage goes, "you get what you pay for". This is really true with power banks due to the fact the most essential components, the batteries, control circuitry and safety characteristics are all hidden inside the external battery charger bank. Would you connect your pricey smart phone into a inexpensive power source that could be cutting corners on safety functions like short circuit, over charging, and temperature protection mechanisms in order to obtain the low cost. 5. Quantity of Ports Larger capacity battery packs also typically come with more than one USB charging ports. Naturally, more ports cost more money, and the quantity of ports you should go for depends on how many devices you carry. The greatest benefit of additional ports is that you can charge more devices at the very same time. There are of course other power banks that have a total output of 4 amps so both devices are able to charge as quick as they can, but as you can expect, they generally come at a premium..