RAVPower 10000mAh power bank

Amazon.co.uk Price: £15.99 (as of 01/08/2019 10:12 PST- Details)

Small Body, Big Power: Small enough to be carried around – big enough (10000mAh) to charge an iPhone 8 up to 3.2 times, a Galaxy S8 up to 2.0 times, and an iPad mini 4 about 1.2 times
Great Efficiency Boost: Being recharged 2 times faster thanks to the two DC 5V / 2A input
Two Devices at a Time: Quickly and smartly charges a smartphone and a tablet at the same time via iSmart ports with the total 3.4A output(Each 2.4A max)

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RAVPower 10000mAh power bank