Both the mechanical and electrical values of the grid have to be optimized since its purpose is to absorb the active material and conduct electricity.
The grid lead must be hardened with an alloy so as to increase the mechanical strength of the grids. However, the grid is subject to unavoidable corrosion from the battery acid since the alloy constituents of the positive grid are exuded over time. Therefore the choice of alloy components is vital to the quality of the battery.
In lead-antimony alloys, antimony is mixed with the grid lead. The battery's cycle-stability is improved but this leads to increased water consumption so that this alloy is less suitable for starter batteries and more appropriate for supply batteries.
The negative grid in modern hybrid batteries consists of a calcium alloy and the positive grid from an antimony alloy.