Decode the critical error signaling a failing battery or charging system issue.
Four beeps indicate a voltage drop, triggering a safety halt when the motor needs power.
Aging battery cells develop high internal resistance, failing to sustain the suction motor's heavy current.
Hair-clogged brush rolls force the motor to overwork, accelerating battery death and causing sudden failure.
Dirty charging pins or unstable base positioning cause micro-cycling, which destroys the battery management system.
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