My son-in-law knows that I love Tech Toys and that I need all the energy I can get. When he came down to visit on the weekend he brought me a present.
It's a Satechi 10000 mAH Portable Energy Station which got a great review on Wirecutter. It should ensure that I have all the energy I need for the days I intend spending in archives and libraries and the long journeys I have ahead of me. It will be useful for charging my trio of Samsungs, the phone, the camera and the tablet. Thanks David.