The best replacement for lithium ion is nimh.

The best alternatives to lithium ion are rated as following:
★★★★★  nimh
★★★★  lithium polymer
★★★★  nickel cadmium
★★★  nicad
★★★  polymer
★★  lead acid
★★  nickel metal hydride
★  nicd
★  lipo
★  lithium metal
★  nickel metal hydride batteries
★  nicad drill
★  nicad tools
★  fuel cell
★  lithium
★  lithium polymer battery
★  lifepo4
  nicad battery
  lithium polymer batteries
  imr
  nickel cadmium batteries
  xrp
  nickel
  lithium battery
  ni cad
  aa batteries
  lead acid batteries
  lithium batteries
  nimh batteries
  lithium iron phosphate
  ni-mh
  li polymer
  nimh rechargeable
  nickel hydride batteries
  nimh battery
  lead acid battery
  polymer battery
  nickel metal
  li-po
  lithium ion polymer

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Google Trends

Scale is based on the average worldwide traffic of lithium ion in all years. Click on graph for more.
lithium ion
nimh
lithium polymer