This has to be ultimate accessory for anyone using Apple products. With one of these you can run a Macbook for hours and hours, an iPad for days, and an iPhone for weeks. There's only one problem; Apple took legal action to stop Hypermac using the patented Apple MagSafe magnetic power connector. They were only using them, mind you, not making them. But Apple went ahead anyway and spoiled the party. Originally the Hypermac batteries came with a cable with a MagSafe connector at one end and a DC power plug at the other. And they worked brilliantly. Hours of power for any Apple product or indeed any product with a USB connector.
However do not despair. Hypermac have come up with a slightly convoluted but legal solution involving various new bits of wire and boxes which you can read about on their website. It's a pity Apple have been so dog-in-the-manger about this excellent and very useful product, which made Apple products more adaptable. The Hypermac battery is a good buy with a Hypermac solution for connecting it to your computer, tablet or phone.