Anker's Astro E4 is the middle model in Anker's range of external batteries, and it is intended for use with a range of portable devices, mainly smartphones and tablets. It is meant as a backup battery for persons who travel or may find themselves away from electricity for some time. It uses two USB ports to connect to such devices and can charge two at once. Essentially any product that charges via a 5V USB input is compatible with this battery. Anker estimates that any given smartphone can be recharged from 3-6 times based on one charge of the Astro E4. Several adapters are included with this battery. It takes approximately 8-9 hours to fully charge the Astro E4 from dead.
- 13000mAh capacity
- Capable of recharging smartphones multiple times
- 5V / 3A charge output
- Dual USB ports allow multiple device charging
- Built-in flashlight
- LED indicators show remaining life
- Lithium-ion battery
- Expected life of 500 recharge cycles
The Astro E4 is compatible with all Apple and Android smartphones, tablets and other 5V input USB-charged devices. Note that the iPod nano and some GPS and Bluetooth devices are not supported.