I have recently become interested in the Ryobi line of tools that are based on their 18V battery packs. There is a wide line of useful handheld tools offered including drills, hot glue guns, flashlights and more. These are great for use around the home, portable at a campsite and during a power outage. Ryobi also offers power stations for USB charging and even 120VAC output. The utility of this unified framework of tools and batteries has a lot of benefits. A common battery platform allows the tools to be offered at a much lower price.
Given how readily available and affordable these batteries can be, I am interested in using them to power gadgets outside of the choices that Ryobi offers.
My personal homepage.