![]() ![]() Both of our test models included LED indicators that, when the main button on the pack was tapped, displayed the remaining charge in a simple incremental display (the RAVPower used 4 LEDs and the Jackery used 3). When our RAVPower external pack has a full charge, for example, the LED flashlight is good for a massive 800+ hours of use.Īnother useful feature,with a much more practical application than a flashlight, is indicator lights. You use battery packs most often when you're traveling, and since you'll likely have the battery pack in hand when you're rooting around in your bag or luggage looking for cables and whatnot in an unfamiliar setting, that burst of light is more than handy. At first glance it seems pretty gimmicky, but we think it's quite clever. One of our favorite extra features is the inclusion on many battery packs of an LED flashlight. Our 14,000 mAh beefcake that can keep your iPad running over a trans-continental flight? It weighs two pounds or so and won't be very comfortable in your pocket. The little lipstick-sized battery packs we mentioned a moment ago might only have 2,000 or so mAh in them, but they only weigh a few ounces and easily slip into your pocket or purse. ![]() Just like in every other battery application, there's a trade off to be had between high and low capacity devices, and that takes the form of weight. While both of our test models are well suited for this job, only the extra-big RAVPower with 14,000 mAh would be able to truly power both of our devices with a 100%+ boost. If you only cared about keeping your iPad going during your flight and you'd have your phone turned off, then you could stick with a battery pack that had around the 11,560 mAh capacity of the iPad to double its life. If you wanted to squeeze 50 percent more life out of them, you'd need a device with at least a capacity of 6,830 mAh. Not all battery packs are created equal, however, and even if the build quality is good, you can easily end up with an external battery pack that doesn't fit your application and power needs. Instead of plugging your charging cable into the wall, you instead plug the charging cable into the battery pack and fill up the device's batteries that way. They range in size from as small as a lipstick tube (good for topping off a small smartphone battery) to as big as a thick paperback book (good for keeping your phone going for days or letting multiple friends juice up their tablets). This is where an external battery pack comes in handy. That's not always convenient (or even possible) if you're traveling or otherwise away from home. Related: This Portable USB Charger Battery Pack Can Also Jump Start Your Car You top the device off (or keep using it while it charges in the background) and away you go. Normally when you need more juice for your smartphone, tablet, or other mobile electronic device, you plug the USB charging cable in to your computer or to a wall-wart transformer. What's an External Battery Pack and Why Do I Want One?
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