Power tool battery pack wireless charger

A wireless charger for charging multiple power tool battery packs, comprising:

• a housing with a deck for supporting a first power tool battery pack, and a wall for directing movement of the first power tool battery pack relative to the deck;
• a first wireless charging circuit disposed within the housing, the first wireless charging circuit having a first transmitter coil disposed below the deck, a first control circuit for controlling the amount of power that is provided to the first transmitter coil, and a first communication circuit connected to the first control circuit, the first communication circuit that receives information from the first power tool battery pack;
• and
• a second wireless charging circuit disposed within the housing, the second wireless charging circuit having a second transmitter coil disposed below the deck, a second control circuit for controlling the amount of power that is provided to the second transmitter coil, and a second communication circuit connected to the second control circuit, the second communication circuit that receives information from a second power tool battery pack disposed on the deck.

A power tool battery pack comprising:

• a housing having first and second walls;
• at least one rechargeable battery cell disposed within the housing;
• a first receiver coil disposed within the housing for receiving a magnetic field generated by a wireless charger, a voltage induced in the first receiver coil being used to charge the at least one rechargeable battery cell;
• a control circuit connected to the first receiver coil for controlling the amount of power that is provided to the at least one rechargeable battery cell;
• and
• a communication circuit connected to the control circuit for providing control information to the wireless charger.