PURPOSE: To obtain a sealed clad type lead battery with excellent discharging capacity and cycle lifetime by installing a group of electrode plates composed of specified separators, positive and negative plates into an electrolytic cell with pressure more than a specified value under the state of being dry before putting electrolyte into the electrolytic cell.

CONSTITUTION: Glass fiber formed into sheet with uniform fiber diameter of less than 10μm is used for a separator 3 and gelled dilute sulfuric acid for electrolyte. A group of electrode plates composed of separators, positive and negative plates 2 with pressure more than 20kg/dm2 per apparent surface are (longitudinal and transverse dimensions of a plate) of the positive plate is accommodated in an electrolytic cell under the state of being dry before putting electrolyte into the electrolytic cell. The glass separator 3 extremely increase its surface contacting with the positive plate 1 by strong pressing and has the construction in which the separator easily absorbs H2SO4 formed at charging. Thus, the gap of the clad type positive plate and the separator becomes about half compared with a conventional battery not being pressed. Therefore, discharging capacity and cycle lifetime are extremely improved.