My solar-powered iPhone

The PowerBank 2000 is the latest in a long line of solar-powered chargers from Sandberg. It's far from being the most powerful backup battery for your smartphone (and yes it will charge Droids as well as iPhones, but as I'm an iPhone user I can only talk about my experiences with that) but it is one of the smallest and lightest. Not that the specs are lightweight per se, with the name giving away the fact that there's 2000mAh worth of capacity in the thing. Producing 1000mA output, the SolarBank will happily charge up my iPhone if I'm away from home and away from another power supply. Although I was told it wouldn't charge the rather more power-hungry iPad that also resides in my manbag, truth be told it did actually manage to power it back from 90% to a 100% charge in just a matter of minutes. I wouldn't rely upon it as an iPad backup battery to be fair, but in case of emergency it may just be enough to get you access to your tablet in order to do what needs doing!