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In this study, an energy-saving adaptive fast-charging strategy is developed and applied to a Li-FePO4 battery module. In this strategy, there are three options including an adaptive constant current (CC)/constant voltage (CV) control scheme, an adaptive variable current (VC) control scheme, and an adaptive current-voltage control scheme to be selected by the user. The objectives of fast charging and energy saving can be simultaneously achieved by the well-designed circuit components in a charge circuit (i.e. a boost converter) plus the proposed adaptive fast-charging strategy. In this study, the maximum conversion efficiency of the boost converter is 97.7- and its average conversion efficiency is over 95-. Moreover, the charge speed and energy saving of a CC/CV framework with a conventional proportional-integral control scheme can be enhanced to reach uppermost 19.2 and 1.33- improvement rates by the adaptive current-voltage control scheme and the adaptive VC control scheme, respectively.