Anker has a ton of great batteries available, and right now they have the Astro E5, 16,000mAh battery pack on sale for just $39.99. Which is an amazing price! Typically it is $89.99, so that's a great deal right there. With it being a 16,000mAh battery pack, it means that it's going to charge your devices a few times before it dies, which is great.
The Anker® Advantage: Join the 6 million+ powered by Amazon's #1 charging brand. Exclusive PowerIQâ„¢ Technology: Detects your device to deliver its fastest possible charge speed up to 3 amps. Enormous Capacity: Charges the iPad Air more than once, the Galaxy S5 four times, the iPhone 5s over seven times and other smartphones multiple times. Recharges in 8-9 hours with a 2 amp adapter (not included) and the included Micro USB cable. Superior Quality: Premium LG cells, cutting-edge circuitry and a sturdy gloss exterior ensure reliability and safety. To activate the LED flashlight, hold or double click the power meter button. What You Get: Anker® 2nd Generation Astro E5 External Battery, Micro USB cable, travel pouch, welcome guide, our fan-favorite 18-month warranty and friendly customer service.
Anker® 2nd Gen Astro E5 16000mAh External Battery Pack with PowerIQâ„¢ Technology 2-Port 3A Output Portable Charger Power Bank for iPhone 6 Plus 5S 5C 5 4S, iPad Air, mini, Galaxy S5 S4 S3, Note 4 3 2, Tab 4 3 2 Pro, Nexus 4 5 7 10, HTC One, One 2 (M8), LG G3, MOTO X G, most other Phones and Tablets (Black).