Patent ID: 8581552

Claim:
A battery pack comprising: at least one battery cell, wherein said battery cell either supplies a discharging current to a load or receives a charging current from a power source at an end of a stand-by-state of said battery pack; and battery state monitoring circuitry configured to detect said end of said stand-by-state of said battery pack based on a transition of a supply voltage of said at least one battery cell wherein the transition is caused by said discharging current or said charging current and said monitoring circuitry is a circuitry with low power consumption which comprises: a first comparator configured to detect a positive voltage transition and provide a first output signal, a second comparator configured to detect a negative voltage transition and provide a second output signal, wherein said first and second comparators are low consumption comparators, and output decision circuitry configured to accept said first output signal and said second output signal and provide an output signal, said output signal representative of said end of said stand-by-state of said battery pack if said first output signal is representative of said positive voltage transition or said second output signal is representative of said negative voltage transition.