Batteries for most of the devices that we as photographers use these days are far from common at local shops (especially here in Columbia, SC) and far from cheap at the specialty retailers who stock them. Aside from a few devices that use standard AA (LR6) batteries, electronic camera accessories use special rechargeable or photo lithium batteries like the Canon Speedlite ST-E2 transmitter which takes a 2CR5 lithium, or the Sekonic L-358 Light Meter that takes a CR123A, or our backup Audio Technica wired lavalier mic that uses 357 button cells, not to mention the cameras themselves, on the notebook computers we use to process our images on location. In situations where I’ve been in a pinch and needed something immediately the folks at the local Batteries Plus store on Harbison Boulevard have always come to my rescue. They always seem to have what I need in stock at a fair price with good customer service. I can’t count the number of Rayovac Lithium 2CR5’s, CR123A’s, CR2450’s and 357 button cell batteries that I have bought from them over the years.