FUNDAMENTAL-STUDIES TO DEVELOP THE MAINTE NANCE FREE LEAD-ACID-BATTERIES .3. TREATMENT OF POSITIVE PLATE FOR INCREASE OF RECHARGEABILITY OFSEALED LEAD-ACID-BATTERIES

Generally, it is difficult to recharge the sealed lead-acid battery af ter overdischarge. Thus, the improvement of the rechargeability of the overdischarged sealed lead-acid battery was examined. The formation o f PbSO4 from the oxide layer on the interface between the grid of the positive plate and the active material during the overcharge affected to reduce the rechargeability after overdischarge. The dipping of the positive plate in dilute H2SO4 for 48 h at 40 degrees C improved the r echargeability after overdischarge.