The best replacement for 2s is 3s lipo.

The best alternatives to 2s are rated as following:
★★★★★  3s lipo
★★  3s
★★  3s lipo battery
★  2s1p
★  2's
★  4s
★  2s2p
★  leappad 2
★  leap pad 2
  2r
  innotab 3s
  3s slash 4x4
  xda 2i
  innotab 3
  3s battery
  carrera 4s
  leappad2
  leapfrog 2
  innotab 2

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