A power supply system can include an electrical battery for supplying electrical load using pulse discharge; and a control unit to control the electrical battery to pulse discharge by periodically switching between a discharge state of the electrical battery, when the electrical battery is connected to the electrical load, and a rest state of the electrical battery when the electrical battery is disconnected from the electrical load. During the pulse discharge, the control unit can control a power source for supplying an injection current to the electrical battery during a rest period when the electrical battery is in the rest state. The control unit can further determine the voltage of the electrical battery during the rest state, and when the voltage does not meet a threshold value increase the duration of the rest period, until said threshold value is reached. Other systems, methods and apparatuses are described.
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