Being a musician, 9 volt batteries are one of my best friends (in fact, I just bought one today - bad I know, I have rechargeable ones at home - but sometimes you just need one right away).
These would make great gifts for my musician friends who always have 9 volt batteries, but don't always have flashlights (which musicians also need for finding their way and plugging in cables into the backs of amplifiers on darkened stages...)
