Wal-Mart, Goodman's and FactoryOutletStore.com sell replacement energy cells for Braun cordless curling irons. These vendors also sell many other Braun products, including standard curling irons and electric razors.
Each energy cell lasts about 11 weeks under average use, according to BraunCurlingIron.com. The cartridges are available in packs of two and in bundles containing a one-year supply.
Braun manufactures several cordless curling irons, including the C21 Smoothstyler. The Smoothstyler has a 7/8-inch ceramic barrel, heats in 60 seconds and has an insulated cover for immediate storage after use. This iron runs on disposable butane energy cells and has a cell depletion meter in the handle.