As off-board battery charger for electric vehicles (EVs) has little limitations of weight, volume and power capacity, this paper introduces a new architecture for off-board battery charger. It is based on multi-pulse flexible-topology thyristor rectifier, which operates in series or parallel mode via flexible-topology switching, according to battery voltage. By flexible-topology operation, the proposed mPFTTR-based battery charger is adapted to charge battery pack with different voltages and power. Fast current response is achieved by the predictive current control strategy which enables fast charging. Simulation and experimental results are presented to demonstrate the validity of the mPFTTR-based off-board unidirectional battery charger.