In spite of their lower energy density, lead acid batteries are much more economical, but they are prone to sulfation in HEV applications.

• 然而具有储存能源能力之二次电池则为此问题的解决方案之一。由于新兴科技产品-磷酸锂铁电池为目前所有大型二次电池之中，性能最优异者。