First Look Gear Review
Street Price: $40 | Compare prices at 1 resellers
Pros: Recharges a phone 3-6 times, fast recharging, two USB ports
Cons: Not the most compact option
Best Uses: Emergency power for phone, airline flights, spare flashlight
This is currently our favorite robust USB external battery charger. It will charge a smartphone 4-6 times and a tabled 2-4 times. More importantly, it charges fast. Most external batteries, including the first generation Astro, charge at a maximum of 1 amp while the 2nd Gen Astro charges your device at up to 4 amps. In additon, the input power is 1.8 amps while many other external batteries have an input power of less than 1 amp. What does this mean in the real world? It takes about 2 hours to charge an iPhone 5 compared to 3-4 hours with most external batteries and 1 hour 40 minutes from a wall charger.
You can charge the Astro from anything you can plug the included USB cable into: wall socket, computer, your car, or a portable Solar Charger. Best fof all, you can charge three devices at once.
If you want to save money and weight, check out the Anker Asto Mini 3000 mAh. It does not charge as fast as the 2nd Gen Astro and only charges a smatphone 1-2 times, but it comes with a flashlight and is about a 1/3 the weight and cost.
Another option if you are away from a power source for a long time is the Bushnell Bear Grylls SolarWrap Mini. It has a small internal battery but charges but can be charged from the sun when needed and is relatively light.
— OutdoorGearLab Review Staff
OutdoorGearLab Member Reviews
Most recent review: January 12, 2014
Where's the Best Price?
*Help support OutdoorGearLab. If you click on one of the seller links and make a purchase, a portion of the sale helps support this site
Related Best-in-Class Review
Get More OutdoorGearLab
Follow us on Twitter, be a fan on Facebook!
Related Gear Reviews
Other Gear by Anker
Recent Best-in-Class Reviews