I can read amazon too.

Link for the lazy: http://smile.amazon.com/dp/B00SDY3RLO

I got one of these https://www.amazon.com/dp/B00SDY3RLO/ref=cm_sw_r_other_awd_AO26wbBWPT40Vfor Ingress and Geocaching. Charges my G4 from 15% 3 or 4 times.

Screw Anker, I went with this and I love it.

http://www.amazon.com/Ingress-First-Official-cheero-12000mAh/dp/B00SDY3RLO/ref=sr_1_1?ie=UTF8&qid=1459030505&sr=8-1&keywords=ingress

also comes with an ingress code to redeem a few viruses and power cubes.