Battery-Driven Power Tool and Battery Pack Therefor

A battery pack comprising:

• a rechargeable battery;
• a connection port selectively connectable to a power tool body and a battery charger;
• a battery voltage detecting section configured to detect a battery voltage output from the rechargeable battery;
• a display section;
• a control section configured to determine a voltage level status of the rechargeable battery based on the battery voltage detected by the battery voltage detecting section, control the display section to indicate the voltage level status of the rechargeable battery, and further determine whether connected is the power tool body or the battery charger, wherein the control section is free from determining the voltage level status when the control section determines that the power tool body is connected to the connection port and being driven.

A battery pack comprising:

• a rechargeable battery;
• a connection port selectively connectable to a power tool body driven by the rechargeable battery;
• a battery voltage detecting section configured to detect an actual battery voltage output from the rechargeable battery at a time when the power tool body is being driven, detection of the battery voltage being performed at every predetermined interval;
• a display section;
• and
• a control section configured to compute, based on two actual battery voltages successively detected by the battery voltage detecting section, a potential battery voltage unaffected by a battery voltage drop temporarily occurring during driving of the power tool body, and control the display section to indicate a voltage level status of the rechargeable battery based on the computed potential battery voltage.

A power tool comprising:

• a power tool body including a motor;
• a rechargeable battery connected to the motor;
• a battery voltage detecting section configured to detect a battery voltage output from the rechargeable battery;
• and
• a determining section configured to determine a voltage level status of the rechargeable battery based on the battery voltage detected by the battery voltage detecting section, wherein the determining section is free from determining the voltage level status when a rate of change in the battery voltage is equal to or greater than a predetermined criteria.

A power tool comprising:

• a power tool body including a motor;
• a rechargeable battery;
• a connection port selectively connectable to the power tool body and a battery charger;
• a battery voltage detecting section configured to detect a battery voltage output from the rechargeable battery;
• a display section;
• a control section configured to determine a voltage level status of the rechargeable battery based on the battery voltage detected by the battery voltage detecting section, control the display section to indicate the voltage level status of the rechargeable battery, and further determine whether connected is the power tool or the battery charger, wherein the control section is free from determining the voltage level status when the control section determines that the power tool body is connected to the connection port and being driven.

A power tool comprising:

• a power tool body including a motor;
• a rechargeable battery;
• a connection port selectively connectable to the power tool body driven by the rechargeable battery;
• a battery voltage detecting section configured to detect an actual battery voltage output from the rechargeable battery at a time when the power tool body is being driven, detection of the battery voltage being performed at every predetermined interval;
• a display section;
• a control section configured to compute, based on two actual battery voltages successively detected by the battery voltage detecting section, a potential battery voltage unaffected by a battery voltage drop temporarily occurring during driving of the power tool body, and control the display section to indicate a voltage level status of the rechargeable battery based on the computed potential battery voltage.