Patent ID: 7817053

Claim:
A rechargeable electric tool comprising: a power source which is a secondary battery; a power source switch that is electrically coupled to the power source and adapted to complete an initializing operation in the rechargeable electric tool and place the rechargeable electric tool in a standby state when the power source is electrically coupled to the rechargeable electric tool; a trigger lever that is electrically coupled to the power source switch and adapted to complete one cycle of operation of the rechargeable electric tool when the trigger lever is pulled; a voltage comparing device which compares a voltage of the power source with a reference voltage when the trigger lever is pulled; and a warning device which indicates a warning in accordance with a result of the comparison of the voltage comparing device, wherein when the voltage of the power source is reduced to be equal to or lower than the reference voltage, the warning device indicates the warning, and the trigger lever is unaffected such that the rechargeable electric tool is still operable from after the warning until the electric tool stops in response to the battery being fully discharged.