Originally Posted by
noglider
On my metric century ride this past fall, I connected my iphone 6S to an Anker Astro E1 battery. I set the screen to stay on constantly. By the end of the many-hour ride, the phone was at 100% and the Anker battery was nearly drained. That's perfect.
Anker battery and power products are top notch. They work better than the originals and if you ever have a problem with an Anker product, there is no problem. They'll replace it. No hassle.