Energizer MAX, 2 pack, size "C" Alkaline batteries. MAX Alkaline C Batteries provide a long-lasting power source for such common workplace devices as calculators, pencil sharpeners, cameras, flashlights and portable tape recorders. PowerSeal Technology is the Energizer innovation that delivers energy you can rely on. Batteries also hold their power for up to 10 years while in storage so you have power when you need it most. They are date-coded and 100 percent mercury-free.