NOVELTY - A plate for use in a lead acid battery, comprises a grid, and a paste applied to the grid, where the proportion of sulfate in the paste is 20-40 wt.%. The paste substantially has no free sulphuric acid.    USE - In a lead acid battery such as flooded or sealed lead acid battery, a bipolar lead acid battery (claimed) and in secondary batteries employed in application like automobiles.    ADVANTAGE - The method of preparation of plates does not result in high temperature rise in the battery following acid filling. High temperature is controlled by increasing the proportion of lead sulphate in the plate prior to acid filling of the battery. The increase in the proportion of lead sulphate in the plate is achieved during immersion of the plate in the sulphuric acid bath. Since a large proportion of the lead sulphate required for the battery operation is available in the plates prior to battery acid filling, the battery can be filled with lower specific gravity acid and the temperature does not rise as sharply thus obviating the difficulties of the conventional methods.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) preparing a plate for use in lead-acid battery, involving pasting a grid with a paste to form a plate, curing the plate, drying the plate, immersing the plate in dilute sulphuric acid bath, and drying the plate; or pasting a grid with a paste to form a plate, immersing the plate in a dilute sulphuric acid bath, curing the plate, and drying the plate;    (2) making a flooded or sealed battery, involving preparing positive and negative plates; stacking the plates with interleaved separators to form cells; connecting the positive plates to form positive plate groups and negative plates to form negative plate groups; inserting the plate groups into a battery container; and providing inter-cell and terminal connections for the cells; and    (3) making bipolar battery, involving preparing the bipolar plates; stacking the plates with interleaved separators; inserting the stack into a battery container; and making terminal connections for the stack.