Better Energy Systems is the developer of a line of hybrid solar chargers. Capable of being charged by either sun or wall plug, there is also a model that is chargeable by sun or USB port; a key-chain-sized portable solar charger. All models work off of a rechargeable lithium ion battery and operate within temperature ranges of -4F to 131F (-20C to 55C); capable of charging such devices as cell phone, iPod, GPS, handheld gaming console and digital camera. Better Energy solar chargers hold a charge for up to a year.
