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The concept is ingenious and one can only wonder why it’s taken this long for somebody to come out with them. Invented by a company called Moixa, the founder of which incidentally also created the foldable keyboard for PDAs, the USB Cells are Nickel Metal Hydride AA batteries that recharge over USB. They are, perhaps obviously, the same size as regular AA batteries – if they weren’t they wouldn’t be much use. What’s different is that the top pops off to reveal a standard USB port connector.

With USB ports appearing on every PC, laptop and even games consoles it makes it very convenient to charge them without having to faff around with a clunky wall charger. This will also saving weight and bulk when your travelling. It’s also quicker – while you often have to charge overnight in some conventional chargers, these claim to charge to 90 per cent in five hours. Finally, it’s environmentally friendly, as indicated by the Recyclable icon on the batteries

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