The Anker Astro E5 is a great external battery for anyone's Apple and Android Device. The Astro E5 size is exactly the same size as it predecessor, the Astro E4. The weight of it is pretty heavy holding it in your hand but not anything that is noticeable if you have a bunch of stuff in a bag with this battery in it. The on/off button is quite easy to press and easily pressed if it is stuffed into a bag. The flashlight in the external battery is a big plus. It is a bright LED light that works well if the power is out or looking for something in the night. The light is easily turned on because of the easily pressed on/off buttons. The flashlight is activated by pressing 2 times fast on the on/off button. This battery has 2 USB ports. One is 5 volts at 2 amps and the other is 5 volts at 1 amp. There are 4 LED's that tell how much power the battery pack has left for charging other devices. The battery has a smooth, shiny, reflective and stylish finish which looks awesome. The finish on the battery also attractions a lot of fingerprints which could make the battery look bad if not cleaned every so often.This battery has a massive 15000mah lithium ion battery in it that is packed in a small casing. This battery is smaller than most other external batteries I have researched in the past which is ideal for packing in a small bag. I use this battery to charge my iPhone 5 and my iPod touch 5. I can charge both these devices simultaneously.This product is ideal for someone who travels a lot and uses a smartphone for their business when traveling. This battery is also good for people who go camping and are not around power that watch movies and play games on their device for long periods of time. Other than the buttons being easily pressed this is the perfect external battery for those looking into buying one to use for a long trip or power your friends device and keep your devices charged in case of a black out.The Anker Astro E5 is closely comparable to the Astro E4.Anker Astro E4 13000mAh External Battery Pack Portable Power Bank Charger for iPhone 5, 4S, 4, iPad 4, 3, 2, Mini, iPods; Samsung Galaxy S4, S3, S2, Note 2; HTC One, EVO, Thunderbolt, Incredible, Droid DNA; Motorola ATRIX, Droid; Google Nexus 4, Nexus 7... (This has a 13000mah lithium ion battery) Both of these batteries look identical from the looks to the locations of the ports but the Astro E5 has a 15000mah battery that puts it over the top of the Astro E4.Overall the Anker Astro E5 is a great external battery that can charge your smartphone to 100% and do it again 6-8 more times and has a modern look most smartphones have today. You won't have to worry about your phone dying for more than a week when using this external battery.So far i have charged my iPhone 5 twice and it still has 4 LEDS.Another Update: i have charged my ipod touch 2 times and my iPhone 5 3 times and it now has 1 LED and can still charge my devices.I was supplied a sample for test and evaluation, and I promised that my review is fair and honest. 

Question: How is the battery?
Answer: great external battery