Solio Bolt Solar Charger

We've covered other solar chargers before, but this is certainly the smallest one to come across the desk. The Solio Bolt Solar Charger can be charged either via the sun (approximately a full day of sunlight charges the battery completely) or via a USB charger to a wall outlet (4.5 hours for a full charge).

Unlike other solar chargers, the Bolt is about the same size as a standard external battery. While it can certainly used in that manner, its strength lies in the ability to recharge in sunlight. If you're watching a baseball game, going camping for the weekend or simply working out in the yard, the Bolt can be charging while you enjoy the fresh air.

With an MSRP of $70, it's not significantly more expensive than a standard battery of comparable size and power. The main difference is, of course, that when the standard battery runs dry, you're done.