The present disclosure discloses a method and apparatus of managing battery. The method includes: obtaining a first and second state parameters; determining whether a first and second batteries meet a predetermined first paralleling condition, if yes, powering on a current-limiting module, powering on the bidirectional DC/DC converter being and delayingly powering off the current-limiting module; obtaining a third and fourth state parameters; determining whether the first and second batteries meet a predetermined second paralleling condition, if yes, powering on the paralleling switch and delayingly powering off the bidirectional DC/DC converter. The present disclosure can output a voltage under relatively safe conditions and achieve power supply safety.