Anker 2nd Gen Astro 6000mAh Review
This portable USB charger is fairly light and compact, yet it's capable of topping off a tablet on the go. Most other cheap battery packs don't have the amperage for that.
The Anker 2nd Gen Astro 6000mAh (starting at $26, Amazon) is a powerhouse compared with many other cheap portable chargers. Its 6,000 milliampere-hour capacity allows it to charge most smartphones more than once, yet it remains small enough to fit comfortably in a pocket, backpack, or purse. It also has a 2-ampere output, which delivers a fast enough charging speed for a tablet. An Anker 2nd Gen Astro 6000mAh review at Legit Reviews has particular praise for Anker's proprietary Power IQ technology. This allows the charger to adjust the current as the connected device requires.
Consumers posting reviews on Amazon share the expert enthusiasm for this external battery, awarding it a 4.2 rating based on more than 450 reviews at the time of writing. One reviewer notes that the device never gets hot while charging. That user has found that the charger is able to charge an iPhone 5 more than twice and an iPad 3 once.
This device has a rubberized coating that divides reviewers to some extent. One Amazon shopper observes that the finish is less prone to fingerprints, and another opines that the charger feels significantly hardier than other external batteries on the market. Some reviewers, though, mention that the texture makes this charger slightly more difficult to pull out of a pocket.
The Anker 2nd Gen Astro 6000mAh has an LED power meter that appears when you shake the device to let you know how much power is remaining. The recharge time is five to six hours, according to the manufacturer. This external battery is compatible with USB-charged, 5-volt devices including all Apple and Android smartphones and tablets (including the Nexus 7, although the company specifically notes that it doesn't support the iPod Nano and Classic, HP TouchPad, LG G2 smartphone, Asus tablets, and some GPS and Bluetooth devices). The charger measures 3.7 x 1.8 x 1 inches and 4.8 ounces. It includes a micro-USB charging cable and comes in black, yellow, and green.
The main selling points of the Anker 2nd Gen Astro 6000mAh are its power-to-size ratio and 2-amp output for charging a tablet. A nifty power meter and durable build only add to its appeal, and an 18-month warranty solidifies our recommendation.