Lisa, check out the battery compartments carried by Allparts, chances are excellent that one of them will fill the bill. The question, of course, is which one? But it's a good place to start.... Go to www.allparts.com... type-in "battery" in the upper left keyword search box and check 'em out. There's little doubt that the Fender unit is made by Fishman, Baggs or some major manufacturer, and that's where Allparts shines.