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A battery positive grid is continuously cast of lead and thereafter cold worked to reduce its cross sectional thickness to change the microstructure of the lead and provide enhanced corrosion resistance and other properties needed for positive grids. The as cast thickness is reduced by not more than

A battery positive grid is continuously cast of lead and thereafter cold worked to reduce its cross sectional thickness to change the microstructure of the lead and provide enhanced corrosion resistance and other properties needed for positive grids. The as cast thickness is reduced by not more than ½ or 2 to 1, to produce a positive grid with a lead weight of 0.5 to 2.1 grams per square inch of the area of the plan of the cold worked grid which improves the life of a battery in which it is used. A battery negative grid is continuously cast of lead and thereafter cold worked to reduce its cross sectional thickness 1.2:1 to less then 1.5:1 to increase the ultimate tensile strength needed for a lighter negative grid with a lead weight of 0.3 to 0.9 of a gram per square inch of the area of its plan.

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1. A method of making a positive grid for a positive plate of a lead-acid battery comprising, continuous casting molten lead into an elongate web having a plurality of successive grid blanks each having a substantially uniform thickness, a plurality of spaced apart and interconnected wires having in

1. A method of making a positive grid for a positive plate of a lead-acid battery comprising, continuous casting molten lead into an elongate web having a plurality of successive grid blanks each having a substantially uniform thickness, a plurality of spaced apart and interconnected wires having interstices between them, and a lead weight in the range of 0.5 to 2.1 grams per square inch of the area of the overall plan of the grid after cold working, cold working the grid blanks of the continuous cast web to reduce the thickness of the cast web by not more than 2:1 and to a thickness of not more than 0.035 of an inch, and cutting positive grids from the cold worked web to provide positive grids having substantially increased corrosion resistance in use in positive plates in a lead-acid battery.2. The method as defined in claim 1 wherein the cold worked and reduced thickness positive grid has a microstructure with a smaller average grain size and a more uniform grain structure than that of the as continuous cast web.3. The method as defined in claim 1 wherein cold working the continuous cast web reduces the thickness of the cast web in the range of 1.5:1 to 2:1.4. The method as defined in claim 3 wherein cold working the continuous cast web produces positive grids having a tensile strength of at least 9,000 psi after fully age hardening at room temperature.5. The method as defined in claim 1 which also comprises cold working the continuous cast web to increase the longitudinal length of the cast web at least 1.2:1.6. The method as defined in claim 1 which also comprises cold working the continuous cast web to increase the longitudinal length of the cast web in the range of about 1.2:1 to 1.3:1.7. The method as defined in claim 1 wherein cold working the continuous cast web produces positive grids having a tensile strength of at least 9,000 psi after fully age hardening at room temperature.8. The method as defined in claim 1 wherein the cold working of the continuous cast web occurs at a peak metal temperature in the range of about 35 degrees F. to 180 degrees F.9. The method as defined in claim 1 wherein the cold working of the continuous cast web occurs at a peak metal temperature in the range of about 50 degrees F. to 90 degrees F.10. The method as defined in claim 1 wherein cold working to reduce the thickness of the cast web by not more than 2:1 occurs within 24 hours of continuous casting of the web.11. The method as defined in claim 1 wherein cold working to reduce the thickness of the cast web by not more than 2:1 occurs within 4 hours of continuous casting of the web.12. The method as defined in claim 1 wherein cold working to reduce the thickness of the cast web occurs within ¼ hour of continuous casting of the web.13. The method as defined in claim 1 which also comprises applying electro-chemically active paste to the web to at least substantially fill the interstices with the paste after the cold working of the web.14. The method as defined in claim 1 which also comprises applying electro-chemically active paste to the web to at least substantially fill the interstices of the web with the paste after the cold working of the cast web, and cutting the positive grids from the pasted web to provide positive plates for lead-acid batteries.15. The method as defined in claim 1 wherein cold working to reduce the thickness of the continuous cast web comprises passing the cast web through the nip of at least one pair of compression rollers to reduce the thickness of the web.16. The method as defined in claim 1 wherein cold working to reduce the thickness of the continuous cast web comprises passing the web serratum through the nip of each of at least three pair of compression rollers to reduce the thickness of the web as it passes through the nip of each pair of rollers.17. The method as defined in claim 16 wherein the cast web is reduced in thickness by not more than about 35% as the web passes through the nip of each pair of rollers.18. The method as defined in claim 1 wherein the cold worked and reduced thickness positive grid has a thickness of not greater than about 0.035 of an inch.19. The method as defined in claim 1 wherein the cold worked and reduced thickness positive grid has a thickness of not greater than about 0.032 of an inch.20. A method of making a negative grid for a negative plate of a lead-acid battery comprising, continuous casting molten lead into an elongate web having a plurality of successive grid blanks each having a substantially uniform thickness, a plurality of spaced apart and interconnected wires having interstices between them, and a lead weight in the range of 0.3 to 0.9 of a gram per square inch of the area of the overall plan of the grid after cold working, cold working the grid blanks of the continuous cast web to reduce the thickness of the cast web in the range of less than 1.5:1 to 1.2:1 and to a thickness in the range of 0.022 to 0.010 of an inch, and cutting negative grids from the cold worked web.21. A method of making positive grids and negative grids for positive plates and negative plates of a lead-acid battery comprising, continuous casting molten lead into separate elongate webs having a plurality of successive grid blanks having a substantially uniform thickness and a plurality of spaced apart and interconnected wires having interstices between them with each positive grid and negative grid having a lead weight respectively in the range of 0.5 to 2.1 and 0.3 to 0.9 grams per square inch of the area of the overall plan of the respective positive and negative grids after cold working, cold working the grid blanks of the continuous cast web for the positive grids to reduce the thickness of the cast web by not more than 2:1 and to a thickness not greater than 0.035 of an inch, and cutting positive grids from the cold worked web to provide positive grids having substantially increased corrosion resistance in use in positive plates in a lead-acid battery, and cold working the grid blanks of the continuous cast web for the negative grids to reduce the thickness of the cast web by less than 1.5:1 to 1.2:1 and to a thickness in the range of 0.022 to 0.010 of an inch, and cutting negative grids from the cold worked web.22. A positive grid for a positive plate of a lead-acid battery comprising a grid continuous cast of molten lead as part of a web and having a substantially uniform thickness and a plurality of interconnected wires with interstices between them, the grid being cold worked to reduce the thickness of the as cast grid by not more than 2:1, a cold worked final thickness of not more than 0.035 of an inch, and the grid having a lead weight in the range of 0.5 to 2.1 grams per square inch of the area of the plan of the grid after cold working to provide a continuous cast positive grid for a positive plate of a lead-acid battery having substantially increased corrosion resistance and increased tensile strength after age hardening for 30 days.23. The positive grid as defined in claim 22 wherein the cold worked and reduced thickness positive grid has a microstructure with a substantially smaller grain size and a more uniform grain structure than that of the as cast continuous grid of the web.24. The positive grid as defined in claim 22 wherein the thickness of the as cast grid is reduced in the range of 2:1 to 1.5:1.25. The positive grid as defined in claim 22 which also comprises the grid being cold worked to increase the longitudinal length of the cast grid at least 1.2:1.26. The positive grid as defined in claim 22 wherein the cold worked positive grid has a tensile strength of at least 9,000 psi after age hardening at room temperature after being cold worked.27. The positive grid as defined in claim 22 wherein the grid is cold worked to reduce the thickness of the grid within 24 hours of the continuous casting of the grid.28. The positive grid as defined in claim 22 which also comprises electro-chemically active paste applied to the reduced grid to at least substantially fill the interstices with the paste.29. The positive grid as defined in claim 22 wherein the cold worked and reduced thickness positive grid has a thickness in the range of 0.015 to 0.030 of an inch.30. The positive grid as defined in claim 22 wherein the cold worked and reduced thickness positive grid has a thickness of not greater than about 0.032 of an inch.31. A lead-acid battery comprising, a casing, a plurality of separate cells within said casing, each cell comprising a book of positive plates and negative plates, insulating separators disposed between adjacent plates of different polarity, an active paste applied to said plates, positive connectors joining each of said positive plates together and being connected to a positive battery terminal, and negative connectors joining each of said negative plates together and being connected to a negative battery terminal, said positive plates comprising a positive grid continuous cast of molten lead as part of a web and having a substantially uniform thickness and a plurality of interconnected wires with interstices between them and a lead weight in the range of 0.5 to 2.1 grams per square inch of the area of the overall plan of the positive grid after cold working, and the positive grid being cold worked to reduce the thickness of the grid as cast by not more than 2:1 and to a thickness of not more than 0.035 of an inch to provide a continuous cast positive grid having substantially increased corrosion resistance and increased ultimate tensile strength after full age hardening.32. The lead-acid battery as defined in claim 31 wherein said cold worked and reduced thickness positive grid has a micro-structure with a substantially smaller grain size and a more uniform grain structure than that of the as cast continuous grid.33. The lead-acid battery as defined in claim 31 wherein the thickness of said as cast positive grid is reduced in the range of 2:1 to 1.5:1.34. The lead-acid battery as defined in claim 31 which also comprises said positive grid being cold worked to increase the longitudinal length of said as cast grid at least 1.2:1.35. The lead-acid battery as defined in claim 31 wherein said cold worked positive grid has a tensile strength of at least 9,000 psi after full age hardening.36. The lead-acid battery as defined in claim 31 wherein said positive grid is cold worked to reduce the thickness of the grid within 24 hours of the continuous casting of said grid.37. The lead-acid battery as defined in claim 31 wherein the cold worked and reduced thickness positive grid has a thickness in the range of 0.030 to 0.015 of an inch.38. A lead-acid battery comprising, a casing, a plurality of separate cells within said casing, each cell comprising a book of positive plates and negative plates, insulating separators disposed between adjacent plates of different polarity, an active paste applied to said plates, positive connectors joining each of said positive plates together and being connected to a positive battery terminal, and negative connectors joining each of said negative plates together and being connected to a negative battery terminal, said positive plates comprising a positive grid continuous cast of molten lead as part of a web and having a substantially uniform thickness, a plurality of interconnected wires with interstices between them, and a lead weight in the range of 0.5 to 2.1 grams per square inch of the area of the overall plan of the positive grid after cold working, and being cold worked to reduce the thickness of said as cast grid by not more than 2:1 and to a thickness in the range of 0.035 to 0.015 of an inch to provide a continuous cast positive grid having substantially increased corrosion resistance and increased tensile strength after fall age hardening, and said negative plates comprising a negative grid continuous cast of molten lead as part of a web and having a substantially uniform thickness, a plurality of interconnected wires with interstices between them, and a lead weight in the range of 0.3 to 0.9 of a gram per square inch of area of the overall plan of the negative grid after cold working, and being cold worked to reduce the thickness of said as cast negative grid in the range of about 1.2:1 to 1.5:1 and to a thickness in the range of 0.022 to 0.010 of an inch to provide a continuous cast negative grid having increased tensile strength after full age hardening.39. The lead-acid battery as defined in claim 38 wherein the cold worked and reduced thickness positive grids each have a thickness of not greater than about 0.030 of an inch.40. The lead-acid battery as defined in claim 38 wherein the cold worked and reduced thickness negative grids have a thickness not greater than about 0.015 of an inch.