Patent ID: 8390244

Claim:
An infusion pump comprising: a housing accommodating a syringe, the syringe containing a liquid to be infused; a motor within the housing; a drive system operatively connected to the motor, the drive system to advance a piston of the syringe to expel the liquid from a barrel of the syringe; and a power source in electrical contact with and supplying power to the motor, the power source comprising: a primary battery module; a rechargeable battery module, wherein the primary battery source supplies power to the rechargeable battery module; a first DC-DC converter module in electrical communication with the primary battery module; and a charge controller in electrical communication with the first DC-DC converter module and the rechargeable battery module; wherein the charge controller is in electrical communication with one or more external power sources for charging the rechargeable battery module, wherein the first DC-DC converter supplies power to the charge controller and a second DC-DC converter and wherein the charge controller is configured to maintain a trickle charge from the one or more external power sources to the rechargeable battery module.