Energizer's best selling Alkaline brand worldwide - Energizer Max! Energizer Max provides a leak proof guarantee and long lasting power. Energizer's innovative PowerSeal Technology locks in energy for up to 10 years so you can rely on your batteries to be ready when you are. Ideal for powering an alarm clock you trust to wake you up on time, a torch that will perform when you need it most and greater adventures on your kids walkie talkie.