In extreme conditions, grid corrosion is limited by the addition of Ap9 and by a low calcium content. Additionally, when batteries endure long term storage and overcharging at high temperatures, battery life is increased with the addition of Ap9 no matter what the technology. Ap9 improves the battery recharge ability after a discharge. Additionally, our top quality Exide Extreme range of Passenger batteries has been further enhanced with a new technology additive we call 2xT. The 2xT additive is combined with other active material components to achieve the necessary formulation to improve durability and reliability. 2xT technology in the Extreme range will deliver longer life, hence the backing of extended warranty. This is the top consideration of consumers when purchasing a battery.