The best replacement for 3s is 4s lipo.

The best alternatives to 3s are rated as following:
★★★★★  4s lipo
★★★  3s1p
★★★  2s lipo
★★★  2s
★★  4s quadcopter
★★  6s lipo
★★  leappad ultra
★  6s
★  2048
★  3i
  mazda 3i
  innotab 3
  leapfrog ultra
  leappad2
  leappad 2
  galaxy 4s
  3s1p lipo
  leappad
  i phone 5

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Google Trends

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3s
4s lipo
3s1p