Abstract: Disclosed is a charger device. The charger device includes a housing, defining a volume, that includes a power conversion module to provide output power of between 3-300 W, and a controller configured to determine a current level to direct to one or more rechargeable batteries, and cause the output power to be directed to the one or more rechargeable batteries at a charging current substantially equal to the determined current level. A ratio of the output power directed to the one or more rechargeable batteries and the volume is equal to at least 10 W/in3.

Abstract: Disclosed is a method for charging a rechargeable battery having at least one rechargeable electrochemical cell. The method includes determining a corresponding battery capacity based on identification information received from the rechargeable battery, determining a charging current level to apply to the rechargeable battery based on the determined corresponding battery capacity such that the battery achieves a pre-determined charge that is reached within a charging period of time of 15 minutes or less, and applying a charging current having substantially about the determined current level to the battery.

Abstract: Chargers for charging a rechargeable battery determine a current level to apply to the rechargeable battery such that the battery has a pre-determined charge that is reached within a charging period of time of between 4-6 minutes and apply a charging current having substantially about the determined current level to battery and terminating the charging current after a period of charging time substantially equal to the particular period of time has elapsed.

Abstract: A hybrid power supply includes a switching type DC/DC boost type converter that receives energy from a primary battery cell and is arranged to deliver the energy to a rechargeable cell, set to provide a fixed output voltage that is less than the full charge voltage of the rechargeable cell. The hybrid power supply includes a circuit including a primary battery current control that senses primary battery current, and controls in part operation of the converter to provide constant current discharge on the primary battery side of the hybrid power supply.

Abstract: An electronic device includes electrical circuits that provide operative functionality of the device, a fuel cell to power the electrical circuits during certain periods of operation, an interconnect to connect between a battery and a fuel cartridge to delivery fuel to the fuel cell or power from the battery and a circuit to prevent charging of a fuel cell from a battery when a battery is attached to the interconnect.

Abstract: A hybrid power supply includes a switching type DC/DC boost type converter that receives energy from a fuel cell cell and is arranged to deliver the energy to a rechargeable cell, set to provide a fixed output voltage that is less than the full charge voltage of the rechargeable cell. The hybrid power supply includes a circuit including a fuel cell current control that senses fuel cell current, and controls in part operation of the converter to provide constant current discharge on the fuel cell side of the hybrid power supply.

Abstract: A hybrid power supply includes a switching type DC/DC boost type converter that receives energy from a primary battery cell and is arranged to deliver the energy to a rechargeable cell, set to provide a fixed output voltage that is less than the full charge voltage of the rechargeable cell. The hybrid power supply includes a circuit including a primary battery current control that senses primary battery current, and controls in part operation of the converter to provide constant current discharge on the primary battery side of the hybrid power supply.