Decide what to buy

Cars aren’t the greenest of things so we’re always glad when we find something that we can use to save energy in them. This week’s Green Piece is all about the Sunsei 150 solar car battery charger. It will trickle charge a 12v car battery but can also be used in tractors, small boats, motorbikes and other small vehicles.

It’s ideal if you’re trying to use your car less or take it off the road but you’re worried that the battery will go flat. It will also save electricity if you need to charge your battery via a mains charger. And, of course, it will help all of us who don’t have that handy bleeping noise that alerts us to the fact that we’ve left our lights on when we get out of the car.

All in all, a pretty handy green gadget. You just mount the panel on the inside of your car window, using the suction cups and connect it to the cigarette lighter or directly to the battery with the crocodile clips provided.

You can pick one up here for £29.99 if you’re in the UK or here for $48.88 for US readers.

If you’re always getting lost, you may also want to invest in a sat nav - just think how much petrol you waste and how much CO₂ you emit when you’re correcting ‘navigation malfunctions’!

For all you original iPhone owners who’ve been fed up with your battery life, this new product may ease the pain a little. The iPow, although it sounds like something out of a Batman comic, is actually an external battery case for the original iPhone (3G version on the way).

It can be charged up at the same time as your iPhone and will apparently double the battery life. It also provides a leather top which closes with a magnetic clasp and mini stereo speakers which are twice as loud as the ones on the iPhone.

It’s not the prettiest of things and in my opinion, makes the iPhone look a little clumpy. It’ll also add 98 grams to your handbag or pocket but if you’re after more juice, then I suppose it’s not so bad. You can pick one up at twistedcarbon for £49.99.