Estimating Phase Linearity in the Frequency-Domain ICA Demixing Matrix

A sealed lead-acid battery formed by joining two halves of a battery container. Before joining, the separate halves have grids placed in adjacent recesses, separated by partition walls integral with the wall of the container half. Pairs of adjacent grids are electrically connected through the partition wall. The recesses are alternately filled with positive and negative active materials. Then the halves are joined with a porous separator in each cell of the combined halves separating positive and negative active materials.