The Anker Astro E& battery would be your best choice since it has got the largest charging capacity whilst still maintaining weight and a convenient size . The packaging is the same size as a smartphone that is normal, which that it 'so portable, but has a massive capacity, which is enough to charge an iPhone seven times. It has three USB outputs and a lightening fast 4-amp total output, which ensures your apparatus charge-up as fast as possible (note: each single port maxes at 3 amps).
Among the Anker battery’s features would be your PowerIQ, which keeps your technology charging with no chance of a brief circuit over apparatus. Whether Windows, Apple or Android runs, while charging then the PowerIQ port will detect and accommodate the amperage eliminating slow downs. In addition to the output stabilizer, it also offers power overload recover, automatic shut-off sleep mode and battery cell security.
It’s compatible with most USB-charged apparatus, including Apple's Google Nexus 7, I pad, iPhone and also a number of different brands. Anker also comprises an 18-month warranty, and they will replace the battery life should you encounter any problems. The simplistic yet beautiful case design weighs 15.8 ounces, is quite durable and comes in either black or white.