The best replacement for lead acid is lithium ion.

The best alternatives to lead acid are rated as following:
★★★★★  lithium ion
★★★★  agm
★★★★  lithium
★★★  nicad
★★★  agm batteries
★★★  gel batteries
★★  lead calcium
★★  nimh
★★  lithium iron phosphate
★  nickel iron
★  gel battery
★  lifepo4
★  nickel cadmium
★  nicad batteries
★  gel cell batteries
★  lead calcium battery
★  lithium ion batteries
★  nicd
  lipo
  calcium battery
  nicd batteries
  lithium ion battery
  lead calcium batteries
  lithium battery
  gel cell
  agm battery
  gel cell battery

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Google Trends

Scale is based on the average worldwide traffic of lead acid in all years. Click on graph for more.
lead acid
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