RAVPower Battery Case for iPhone 6 / 6S with Apple MFi Certified Extended Battery Charger with 3000mAh 125 Percent Extra Battery
By Amazon Customer on 29 November 2017
Mine survived a trip to the u-bend yesterday. Don't try this at home; I did so you don't have to!
Disclaimer thingy: a quiet buzzing and a refusal to charge for hours afterwards might be a reliable indicator the device wasn't meant for this kind of adventure.
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