Detecting battery pack type based on battery pack impedance

A battery pack powered device comprising:

• a housing including a battery pack interface configured to receive a battery pack;
• a first sensing circuit configured to detect a battery pack voltage of the battery pack;
• a second sensing circuit configured to detect a current from the battery pack;
• a controller including a processor and a memory, the controller configured to:
• receive a first signal from the first sensing circuit related to a first measurement of battery pack voltage,
• receive a second signal from the second sensing circuit related to the current from the battery pack,
• receive a third signal from the first sensing circuit related to a second measurement of battery pack voltage, and
• control a motor of the battery pack powered device by adjusting motor control parameters based on the first measurement of battery pack voltage, the second measurement of battery pack voltage, and the current from the battery pack.

A method for controlling a power tool, the method comprising:

• receiving a first signal from a first sensing circuit related to a first measurement of battery pack voltage of a battery pack;
• receiving a second signal from a second sensing circuit related to a current from the battery pack;
• receiving a third signal from the first sensing circuit related to a second measurement of battery pack voltage of the battery pack;
• and
• controlling a motor by adjusting motor control parameters based on the first measurement of battery pack voltage, the second measurement of battery pack voltage, and the current from the battery pack.