Patent ID: 8852152

Claim:
A portable infusion pump system, comprising: a pump device including: a pump housing that defines a space to receive a medicine, and a drive system to dispense the medicine from the pump device when the medicine is received in the space of the pump housing; a controller device electrically connectable to the pump device so as to control dispensation of medicine from the pump device, the controller device comprising: a battery pack including a voltage output terminal, a return terminal, a third terminal, and at least one rechargeable battery cell that is coupled to the voltage output terminal so as to provide electrical energy to at least one of a component of the controller device and the drive system of the pump device; a monitor circuit that is configured to sense a voltage of the at least one rechargeable battery cell; a first resistor coupled between the at least one rechargeable battery cell and a voltage sense terminal of the monitor circuit; a second resistor coupled between the voltage sense terminal of the monitor circuit and the third terminal of the battery pack; wherein when a low-resistance connection is provided between the third terminal of the battery pack and the return terminal of the battery pack, the monitor circuit is configured to shift the battery pack to a low power mode that reduces the electrical current drawn from the at least one rechargeable battery cell independent of the voltage of the at least one rechargeable battery cell.