Abstract: A system includes a power tool battery pack, a power tool, a portable power supply, a non-motorized sensing tool, and/or a power tool battery pack charger. A separate computing device, such as a smartphone, tablet or computer, communicates wirelessly with the power tool battery pack, the power tool, the portable power supply, the non-motorized sensing tool, and/or the power tool battery pack charger. The computing device monitors a data value representative of a condition of the power tool battery pack, the power tool, the portable power supply, the non-motorized sensing tool, and/or the power tool battery pack charger, and performs an action responsive to the monitored data value.

Abstract: A power tool system includes a power tool, a power tool battery pack and a battery pack charger. The power tool battery pack is separable from and attachable to the power tool, and electrically connectable to the power tool electrical terminals when attached to the power tool. The power tool battery pack has at least one battery cell, a receiver coil, and a control circuit for controlling the amount of power that is provided to the at least one battery cell. The battery pack charger has at least one transmitter coil for generating a magnetic field which induces a voltage in the receiver coil, and a control circuit for controlling the amount of power that is provided to the transmitter coil.