Best Portable Power Bank to Buy

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so you've left your phone plugged into


the wall all night you wake up with it


fully charged and ready for a full day


of selfies catching pokémon and selfies


of catching pokémon but just a few hours


in you get the dreaded low battery


warning and there's nary an outlet in


sight this is where portable battery


banks can save the day you just whip it


out of your pocket and bam no solar


panel or flashbacks to playing with a


scary jack-in-the-box to get the juice


you so desperately need but with all the


options out there how do you know which


one to pick well aside from the usual


reading reviews and checking


manufacturer reputations just as you


would do with a graphics card a webcam


or an extra-large hamster wheel the most


obvious place to start is with the


battery's capacity it's typically


expressed in milliamp hours which


despite the name is actually not a unit


of time so I just must hate us right but


rather a unit that describes the amount


of electrical energy a device can hold


so you can think of a device whose


battery is rated for fewer milliamp


hours like an iPhone has a cup of water


and a battery bank rated for more


milliamp hours as a bucket of water so a


battery pack with a high milliamp hour


rating can hold enough energy that it


can power up your devices


multiple times or powerup devices like


tablets with a higher battery capacity


themselves so consumer grade battery


banks start around 2,000 milliamp hours


and go all the way up to over 9000 these


devices at the higher end of that range


are capable of charging your average


smartphone eight times or even more but


if you've had a few of them you might


have noticed that battery banks with the


same milliamp hour rating can vary quite


a lot in terms of performance so what


gives for one thing not all batteries


discharged at the same rate all the time


this is especially true if you're


charging devices that draw a lot of


current


such as high-end tablets this lowers the


effective capacity to below what it


would be if you were just charging low


current electronics there's also more to


life than just battery size there are


features to consider in this video here


we compared five rugged battery banks


that advertised everything from built-in


LED flashlights to shock and water


resistance though it should be noted


that some of these claims didn't end up


panning out in the real world and while


we're on that subject there's more to


life than manufacturer's ratings for


capacity to line has published a video


that's me comparing how many times six


different brands of battery banks could


recharge an iPhone se and while most


reputable brands were within fifteen


percent of each other the worst one


tested was less than one third as


effective as some of the others and it


doesn't get easier charging rate going


back to our water analogy is how quickly


you can pour from your bucket to your


cup and is a huge factor for folks who


want to plug in for 20 minutes while


getting ready for that big date and not


have to carry their charger around for


the rest of the night typically battery


banks have either one amp or two amp


outputs both of which are running at the


standard USB 5 volts if you have a


device that can accept two amps of


current as many newer ones can then a 2


amp output on your battery bank will not


only charge your device faster but it


will also keep it running if you need to


use it while it's charging keep in mind


though that chargers labeled as 4.8 amp


or some other high number are usually


referring to total current across all of


the port's which is great if you're


going to be plugging in multiple


power-hungry devices at once if the


regular USB spec isn't enough for you


though there are even some battery banks


that support rapid charging technologies


like Qualcomm quick charge and Samsung


fast charge that can power up your


devices even more quickly by increasing


from 5 volts up to as high as 20 volts


but those require both a device and a


charger that support


now go forth with this knowledge and


find yourself a battery bank that gives


you all the power you've ever wanted


just don't use it to try and invade


Russia in the winter time we all know


how that works out ,



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