Sealed Lead-Acid Battery

During recharge of a lead-acid battery, initially evolves oxygen gas and later hydrogen gas. These characteristics are favorable for a sealed lead-acid battery with oxygen recombination reaction. Under a limited overcharging current, no hydrogen gas evolves at the negative plate resulting in reduced polarization and lower terminal voltage. Several hundred charge-discharge cycles or about five year floating services for the sealed battery can be expected. In Japan, about twenty million cells, mainly portable smaller ones, were produced last year. Stationary sealed batteries with capacity of 30 Ah to 100 Ah have been developed.