Watson AC Adapter for Compact AC/DC Battery Charger Visual Departures VDL-GTFY-150 and yellow

and yellow

The discs themselves are coated for extra durability to withstand scratches and other contaminants such as fingerprints and dust

Solar (with proper filters)

How about a high quality switching ‘wall wart’

Watson AC Adapter for Compact AC/DC Battery Charger Visual Departures VDL-GTFY-150 and yellowRuns on 100 240VAC for Worldwide Use 12VDC, 500mA Output This AC Adapter from Watson powers their Compact AC DC Battery Charger. It allows you to keep the charger on a desktop or other flat surface instead of having it plugged directly into a wall socket with its fold out plug. It runs on 100 240VAC power to enable worldwide use, and outputs 12VDC and 500mA. The attached power cord is 58" long and features a DC plug that connects to the AC DC Charger.