I've had this in my wish list and just had a notification to say it's only £14 for the next 3 hours on a Lightning Deal. Possibly Prime members only I'm not sure.
I've no idea how to get the URL so if someone can help that'd be appreciated.
Anker PowerCore 10000 Portable Charger, One of The Smallest and Lightest 10000mAh External Battery, 10000mAh Ultra-Compact High-Speed Charging Power Bank for iPhone 7/ Plus/ 6/ 6s/ SE, Samsung Galaxy and More
#1 Best Sellerin Phone Batteries