Lead acid battery separators, batteries and related methods

A battery separator having low acid leachable total organic carbon and negative cross ribs, wherein the acid leachable total organic carbon is less than 100 ppm, and having at least one of:

• low basis weight;
• low basis weight and low water loss;
• low basis weight, low water loss and low electrical resistance;
• low basis weight and low electrical resistance;
• and combinations thereof, and having at least two of the following:
• backweb thickness in the range of 125 to 250 microns;
• puncture resistance of >10N;
• oxidation resistance (Perox @ 40 hours) of >50% of the original CMD elongation;
• electrical resistance of <10 mohms-in2;
• a water loss with antimony alloy of <1.5 g/Ah;
• and a water loss with non-antimony alloy of <0.8 g/Ah.

A battery separator having a polyolefin membrane with low acid leachable total organic carbon and negative cross ribs on at least one side of the membrane, wherein the acid leachable total organic carbon is less than 100 ppm, and having at least one of:

• low basis weight;
• low basis weight and low water loss;
• low basis weight, low water loss and low electrical resistance;
• low basis weight and low electrical resistance;
• and combinations thereof, and having at least two of the following:
• backweb thickness in the range of 125 to 250 microns;
• puncture resistance of >10N;
• oxidation resistance (Perox @ 40 hours) of >50% of the original CMD elongation;
• electrical resistance of <10 mohms-in2;
• a water loss with antimony alloy of <1.5 g/Ah;
• and a water loss with non-antimony alloy of <0.8 g/Ah.