The Upp comes in two parts: the hydrogen cartridge on the left and the charger on the right.

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The Upp fuel cell charger converts hydrogen to elecricity for your phone. It's eco-friendly and comes with a clever app that should point the way for all phones, but it has a few problems too.

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Here you can see how big the Upp is, which isn't ideal.

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Despite being designed for travel or camping when you're away from mains power, the Upp is far from portable.

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The two snap together to form the charger.

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The only by-products of this environmentally friendly device are heat and water vapour, which is vented from the charger.

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The charger is about the size and weight of a sturdy torch.

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The Upp charges most devices with a USB connection.

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The charger comes with a clever app that allows you to fine-tune the charging process. In the left-hand screenshot you can see the remaining power in both the charger and your phone, and on the right you can see stats on the battery.

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The hydrogen cartridge attaches magnetically to the charger. The hydrogen cartridges can be refilled but must be exchanged for new ones, which isn't cheap, at £10 (around $17).

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Although eco-friendly fuel cells are a great idea and definitely a technology to watch, in this case the Upp is just too cumbersome and expensive.

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