You are here: Home page » Products Fey Elektronik - Your competent partner in mobile power supplies. Fey Elektronik your battery distributor and battery pack assembler. We either offer standard solutions or customized developments in battery systems and their assembling. Lithium-Ion-Packs Lithium Cylindrical Cells Lithium-Ion Cells Lead-Acid Batteries Button Cells Alkaline Batteries Nickel–Cadmium Batteries Nickel–Metal Hydride Batteries Charging Technology UPS Batteries