The valve-regulated lead-acid (VRLA) batteries of 6DZM20 have shorter life than 6DZM14, which are used in electric vehicle, and appeare premature capacity loss (PCL) phenomenon.

• 实验发现,极板上下部分的电流密度分布不均匀使得远离极耳的极板下半部分电流密度很小,硫酸分层造成电池下部的硫酸密度过高等现象都会导致电池出现早期容量衰减现象。