The Juice Pack Powerstation Duo from Mophie is a simply designed, dual-port portable charger and a decent performer. It's definitely one of the priciest 6,000 mAh devices out there, however, and doesn't include any extra features like the ability to charge devices while it's powering up.
Modern, sturdy design. The Mophie Juice Pack Powerstation Duo comes in black or silver, and at 4.5 by 4.2 inches (equivalent to a deck of cards) is a basic, 12-ounce square battery pack. Lifehacker.com calls Mophie's Powerstation line "metal and sturdy"; iLounge describes it as "elegant." Its dual-port design enables simultaneous charging of smartphones, tablets and other USB devices; there is a standard micro USB plug for powering up the Mophie. A four-light LED status indicator shuts off 30 seconds after the Mophie is plugged into a power source for a recharge, which confuses some users. Mophie advises checking it before unplugging to ensure the charge is complete. Despite its significantly higher price point for a battery pack of this power, the Mophie doesn't come with any bells and whistles like a travel pouch, flashlight or even a USB cable.
Fast phone charging; slower for tablets. Mophie's 6,000 mAh capacity battery (with 2.1 amps total) can charge a tablet and a phone simultaneously, but Mophie advises against charging two tablets at once. Amazon.com reviewers say it charges both tablets and smartphones very quickly, but over a dozen warn that they received a counterfeit version through Amazon.com. The Powerstation Duo is sold for the same price ($100) directly from Mophie, which gives customers a one-year warranty. In iLounge.com's test the Powerstation Duo took nearly five hours to charge an iPad mini, but TechRadar.com editors say the Juice Pack Powerstation Duo gave a 95 percent charge each to an iPhone and Galaxy S4 in an hour and used about half its own battery life. At 6,000 mAh capacity, the Mophie Juice Pack Powerstation Duo is technically on par with batteries like the one-port RAVPower Luster Cube (Est. $30) and the Jackery Giant (Est. $40) , but both of those are high performers at less than half the price. The Mophie cannot be used while it is recharging.
Around 100 Amazon.com contributors give Mophie's Powerstation Duo 3.8 out of 5 stars. Many are happy with the Powerstation Duo, but a handful say they received counterfeit chargers that died quickly.
Review: Mophie Juice Pack Powerstation Duo, Contributors to Amazon.com, As of April 2014
The Juice Pack Powerstation Duo performs well in TechRadar.com's tests, powering up an iPhone (no version specified) and Galaxy S4 in just over an hour, with plenty of battery remaining. Lily Prasuethsut notes that it's a pricey model, and recommends other, less powerful Mophie portable chargers if cost is a concern.
Review: Best Portable Chargers: 16 We Recommend, Lily Prasuethsut, Dec. 19, 2013
Mophie's Juice Pack Powerstation is rated fifth out of the top 5 portable chargers in an unscientific poll of Lifehacker.com readers. Readers like the Powerstation line's "size-to-power ratio, offering powerful battery packs in small form factors," and Alan Henry praises the "metal and sturdy" design.
Review: Five Best External Battery Packs, Alan Henry, May 26, 2013
ILounge.com's Nick Guy gives the Mophie Juice Pack Powerstation Duo a B or Recommended rating, praising its "elegant" design and charging abilities. The Powerstation Duo doesn't perform as well as the standard one-port Powerstation, however.
Review: Mophie Juice Pack Powerstation Duo, Nick Guy, April 24, 2013
ZDNet.com's James Kendrick lists the Mophie Juice Pack Powerstation Duo 6,000 along with five other portable chargers as a good option for business travelers. The chargers aren't tested, but Kendrick likes the Powerstation Duo's built-in overcharge protection (so it won't fry devices) and dual-charging ports. He notes that you cannot use the charger and recharge the battery at the same time.
Review: 6 Portable Chargers for the Mobile Professional, James Kendrick, March 25, 2013