The best replacement for juice defender is green power.

The best alternatives to juice defender are rated as following:
★★★★★  green power
★★★★  easy battery saver
★★★★  battery doctor
★★★  greenify
★★★  du battery saver
★★★  battery defender
★★★  advanced task killer
★★★  battery guru
★★  du battery
★★  ds battery saver
★  power manager
★  power saving mode
★  tasker
★  smart actions
★  go power master
★  stamina mode
★  2x battery saver
★  task killer
  2x battery
  easy battery

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Speaking about juice defender, one probably shouldn't forget about advanced task killer.

Other search terms related to juice defender and their ratings are:
★★★★★ advanced task killer
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Google Trends

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juice defender
green power
easy battery saver