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!