battery boutique
n. A store that not only sells batteries for electronic devices, but also offers battery-related accessories, instructional text, and services such as troubleshooting and reconditioning.

Example Citation:
"'Each of the different battery chemistries do require a different care,' says Ken Hawk, a self-described 'frustrated user' who has sensed a market and founded 1-800-Batteries, one of a small platoon of specialty companies—battery boutiques.
—James Gleick, "Maintenance Not Included," The New York Times, July 13, 1997