12V Lead-Acid Car Battery

Material Composition Assumptions

A typical automotive lead-acid battery weighs approximately 15 kilograms and contains the following components:

• Lead and lead alloys for grid structures and active materials: 8,500g (57%)
• Lead dioxide forming the positive electrode plates: 2,100g (14%)
• Sulfuric acid electrolyte solution: 2,250g (15%)
• Polypropylene or polyethylene battery casing: 1,200g (8%)
• Plastic or glass fiber separator materials: 450g (3%)
• Lead oxide paste for electrode preparation: 500g (3%)

The predominance of lead-based materials drives the environmental profile, while the plastic housing and acid electrolyte contribute secondary impacts during manufacturing.

Manufacturing Geography

China serves as the primary manufacturing region for automotive lead-acid batteries, accounting for the largest share of global production capacity. The country’s grid electricity intensity of 555 kgCO2e per megawatt-hour significantly influences the carbon footprint of manufacturing processes. Chinese facilities benefit from established lead smelting infrastructure and integrated supply chains, though higher grid carbon intensity compared to other regions increases overall emissions. Manufacturing in China also provides cost advantages and proximity to automotive assembly operations throughout Asia.

Regional Variation

Manufacturing Region	Grid Intensity	Estimated CCI Score	Adjustment vs Default
China	555 kgCO2e/MWh	42	Baseline
United States	386 kgCO2e/MWh	38	-9%
Germany	366 kgCO2e/MWh	37	-12%
South Korea	436 kgCO2e/MWh	40	-5%
India	708 kgCO2e/MWh	47	+12%

Provenance Override Guidance

Suppliers can submit the following data types to override the default CCI score:

1. Facility-specific electricity consumption data with hourly or monthly grid carbon intensity factors for the manufacturing location
2. Lead sourcing documentation including percentage of recycled content and smelter emission factors for primary lead production
3. Sulfuric acid supplier certifications with production method details and associated carbon footprint assessments
4. Transportation logistics data covering raw material shipment distances and modal split between suppliers and assembly facilities
5. End-of-life recycling agreements demonstrating actual collection rates and processing efficiency in target markets

Methodology Notes

• The CCI score represents cradle-to-gate emissions including raw material extraction, processing, and manufacturing through factory completion
• Scope 3 dominance reflects the carbon-intensive nature of lead smelting operations and upstream material processing activities
• Functional unit corresponds to one standard automotive battery with twelve-volt nominal voltage and typical capacity range
• Use phase charging emissions are estimated based on average grid mix but vary significantly by regional electricity sources
• End-of-life recycling benefits are excluded from the score despite high recovery rates in developed markets
• Data gaps exist for smaller regional manufacturers and emerging battery chemistry variations within lead-acid technology